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    Home » Recipes

    Easy Fluffy Oven-Baked Omelet Casserole

    Published: Feb 19, 2021 · Modified: Mar 11, 2023 by Jeri Walker · This post may contain affiliate links · 11 Comments

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    Jump to Recipe
    A closeup of a baked omelet casserole.

    This fluffy Oven-Baked Omelet Casserole is the easiest way to make an omelet. It contains protein-packed eggs, tender ham, fresh bell peppers, and wholesome mushrooms. It is perfect for breakfast, brunch, or supper. Make this ahead of time and store it in the fridge for a quick breakfast on busy mornings, perfect for back to school. It takes less than 15 minutes to prep, then pop it in the oven to bake. Set the timer and forget it. Plus, it tastes SO good.

    Oven baked fluffy omelet casserole made with fresh peppers, cheese, and ham. this …

    This breakfast egg casserole is such an EASY way to prepare eggs. It doesn't get any easier, plus it's healthy, high in protein, and low in carbs.

    This is a healthy breakfast idea that you should keep in mind when you are pressed for time. It can easily be adjusted to make for a larger or smaller crowd.

    This egg casserole is filling and satisfying. It bakes up to a puffy, golden casserole that your whole family will love. Eat it as is, or put it inside a wrap for a healthy breakfast.

    Plus, you don't have to stand at the stove waiting for it to cook like you do when cooking a regular omelet.

    For a traditional omelet, try my Spinach Mushroom Omelette With Feta Cheese. And for another easy breakfast casserole, try my Baked Overnight Eggnog French Toast Casserole with Streusel Topping.

    Jump to:
    • 🧡 Why You Will Love This Recipe
    • 🥘 Ingredients
    • 🍳 Instructions
    • 💭 Expert Tips
    • 📖 What else can you put in an omelette?
    • 🥗 Side dishes
    • 🥞 More Breakfast Recipes
    • ❓ FAQs
    • 👪 More Easy Recipes You'll Love
    • 📋 Recipe
    • 💬 Comments

    🧡 Why You Will Love This Recipe

    • Convenient: This fluffy omelette is perfect for busy mornings. You can make it ahead of time and store it in the fridge, then reheat it quickly for a delicious and nutritious breakfast.
    • Easy to make: This omelet recipe is incredibly easy to make, with less than 15 minutes of prep time. Simply mix together the ingredients and pop it in the oven to bake.
    • Protein-packed: Eggs and ham are excellent sources of protein, making this dish a great choice for those looking to increase their protein intake.
    • Delicious: The combination of fluffy eggs, ham, fresh bell peppers, and mushrooms creates a flavorful dish that your whole family will love.
    • Versatile: This healthy breakfast casserole can be served for breakfast, brunch, or supper.
    • Meal prep: Once cooled, transfer individual servings into an airtight container and store them in the refrigerator for up to 4 days. To reheat, simply microwave the individual servings for 30-60 seconds or until heated through.

    🥘 Ingredients

    If these simple ingredients are not already in your kitchen, they can be easily found at your local grocery store.

    The ingredients needed to make a fluffy omelet casserole measured out and placed on a wooden table.
    • Eggs. I used large eggs, including the egg yolks. Eggs have so many health benefits. For instance, eggs have more nutrients -- such as vitamins, minerals, and amino acids -- per calorie than most other foods, are high in protein, help your good cholesterol and lower triglycerides, lower your chance of having a stroke, are heart-healthy, help your eyes, and sharpen your brain.
    • Milk. I used 1% milk, but you can use almond milk, coconut milk, or oat milk.
    • Shredded cheese. I used white cheddar cheese, but you can use your favorite kind. It would be great with sharp cheddar cheese, gouda, swiss, mozzarella, or even feta.
    • Diced ham. Ham goes great in an omelet, just make sure it is already pre-cooked. You can use leftover Baked Ham or leftover Double Smoked Ham. You could also use Air Fryer Bacon, thinly sliced cooked steak, Air Fryer Sausage, Smoked Sausage, leftover chicken from Air Fryer Chicken Thighs, Air Fryer Chicken Breasts, Instant Pot Chicken Breasts, Smoked Chicken Breasts or Smoked Chicken Thighs, or even Smoked Salmon.
    • Mushrooms and bell peppers: (I used orange peppers, but you could also use green bell peppers, or red peppers. You can also use spinach, tomatoes, and leeks. Look in your fridge and use up anything that you have sitting in the crisper.

    This omelet is easy to modify to suit your tastes. Are you a vegetarian? Leave out the meat. Do you want to make it healthier? Add more vegetables. The sky is the limit for what you can do with this baked oven omelet.

    See the printable recipe card for exact measurements and a complete list of ingredients.

    🍳 Instructions

    This oven-baked omelet is very easy to make and takes very little prep time.

    First of all, preheat the oven to 350 degrees F.

    Next, whisk together the eggs in a large bowl. You can also use a hand mixer if desired.

    The eggs in a large glass bowl.
    A whisk mixing the eggs until combined.

    Next, add milk, seasoning salt, and black pepper. Whisk to combine.

    A whisk mixing together the milk and the eggs in a glass bowl.
    The seasoning salt added to the large bowl containing the egg mixture.

    Then, add the diced ham and shredded cheddar cheese.

    The diced ham being added to the bowl of egg mixture.
    The shredded cheddar cheese being added to the egg mixture.

    Next, add the bell peppers and mushrooms. Stir to combine.

    The diced bell peppers being added to the egg mixture.
    The sliced mushrooms being added to the glass bowl containing the egg mixture.

    Finally, pour egg mixture into a greased 9 x 12 casserole dish.

    The egg mixture being poured into a  greased glass baking dish.
    The egg mixture in the baking dish before it goes into the oven.

    Bake for 45 minutes at 350 degrees, until the top is golden brown and the eggs are set.

    The baked omelet casserole in the baking dish on a cooling rack on a wooden table.

    Cut the casserole into squares and serve.

    Enjoy.

    A square of fluffy omelet casserole cut into a square and placed on a small plate.

    💭 Expert Tips

    • Whisk the eggs well to ensure that they are fully combined and aerated. This will help create a light and fluffy texture.
    • Use a casserole dish that is the appropriate size. If the dish is too large, the omelet may become dry and overcooked.
    • Allow the omelet to rest for a few minutes before serving to help it set.
    • Consider adding spinach, tomatoes, or onions to give the dish extra flavor and nutrition.
    • Don't overcook the omelet. It should be slightly firm to the touch but still moist and tender.
    • If using vegetables that release moisture, such as fresh mushrooms or tomatoes, consider sautéing them in a separate pan before adding them to the egg mixture. This will prevent the omelet from becoming watery.
    • Store leftovers in an airtight container in the refrigerator for up to 3 days. To reheat, microwave on high for 30 seconds to 1 minute, or until heated through.

    📖 What else can you put in an omelette?

    • Crisp bacon.
    • Diced tomatoes or cherry tomatoes.
    • Leeks.
    • Fresh herbs.
    • Spinach.
    • Green onions.
    • Garlic.
    • Zucchini.
    • Celery.

    🥗 Side dishes

    • Avocado.
    • Fruit.
    • Tomatoes.
    • Hash browns.
    • Crispy oven-roasted potatoes or hashbrowns.
    • Salad.
    • Air Fryer Toast.
    • English muffin.
    • Buttermilk Sheet Pan Pancakes.
    • Baked Overnight Eggnog French toast.

    🥞 More Breakfast Recipes

    • Baked Overnight Eggnog French Toast Casserole
    • Spinach And Mushroom Omelet
    • Instant Pot Hard Boiled Eggs
    • Homemade Buttermilk Sheet Pan Pancakes
    • Crispy Buttermilk Belgian Waffles

    ❓ FAQs

    Are omelets healthy?

    Yes, omelets can be part of a balanced diet. They are mainly composed of eggs that are nutrient-dense, heart-healthy, and an excellent source of protein.
    However, how healthy they depend on what you put into your omelet. For example, if you add lots of vegetables to your omelet, it will contain fiber, vitamins, and minerals. Because this omelet is oven-baked and not fried, there is no added fat with oils to add calories.

    Can I make this recipe ahead of time?

    Yes, you can make this omelet casserole ahead of time and store it in the fridge. Reheat it in the oven or microwave before serving.

    How do I know when the omelet is cooked?

    The omelet is cooked when it is puffed up, golden brown, and a toothpick inserted in the center comes out clean. This should take about 45 minutes in the oven.

    Can I add more seasoning to the recipe?

    Yes, you can adjust the seasoning to your liking. You can add more salt, pepper, or any other spices you prefer.

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      Crispy Oven-Roasted Potatoes Recipe
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    • A spoon in the strawberry banana smoothie bowl that is topped with strawberries, banana, coconut, and chia seeds.
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    If you’ve tried this Fluffy Oven-Baked Omelet Casserole or any other recipe, please take a moment to rate the recipe 🌟🌟🌟🌟🌟 and leave a comment below with your thoughts!

    📋 Recipe

    Oven baked fluffy omelet casserole made with fresh peppers, cheese, and ham.

    Fluffy Oven-Baked Omelet Casserole Recipe

    This fluffy oven-baked omelet casserole is a healthy breakfast idea that my family loves, and it takes less than 15 minutes of prep before baking.
    4.94 from 30 votes
    Print Pin Rate Save Saved!
    Course: Breakfast
    Cuisine: American
    Prep Time: 15 minutes
    Cook Time: 45 minutes
    Total Time: 1 hour
    Servings: 8
    Calories: 204kcal
    Author: Jeri Walker
    Prevent your screen from going dark

    Ingredients

    • 12 eggs
    • 1½ cup milk
    • ¾ teaspoon seasoning salt
    • ¼ teaspoon black pepper
    • 1½ cup diced ham
    • 1 cup shredded cheddar cheese
    • 1½ cup finely chopped bell peppers
    • 1 cup canned mushrooms drained

    Instructions

    • Preheat oven to 350 degrees F.
    • Whisk together the eggs in a large bowl.
    • Add milk, seasoning salt, and black pepper. Whisk to combine.
    • Stir in diced ham, cheddar cheese, bell peppers, and mushrooms. Stir to combine.
    • Pour into a greased 9 x 12 baking dish.
    • Bake at 350 degrees F for 45 minutes until golden brown on top and eggs are set.
    • Cut the casserole into squares and serve.
    • Enjoy!

    Notes

    Nutritional information is approximate and is meant as a guideline only.
    Expert Tips:
    • Whisk the eggs well to ensure that they are fully combined and aerated. This will help create a light and fluffy texture.
    • Use a casserole dish that is the appropriate size. If the dish is too large, the omelet may become dry and overcooked.
    • Allow the omelet to rest for a few minutes before serving to help it set.
    • Consider adding spinach, tomatoes, or onions to give the dish extra flavor and nutrition.
    • Don't overcook the omelet. It should be slightly firm to the touch but still moist and tender.
    • If using vegetables that release moisture, such as fresh mushrooms or tomatoes, consider sautéing them in a separate pan before adding them to the egg mixture. This will prevent the omelet from becoming watery.
    • Store leftovers in an airtight container in the refrigerator for up to 3 days. To reheat, microwave on high for 30 seconds to 1 minute, or until heated through.
     

    Nutrition

    Serving: 1grams | Calories: 204kcal | Carbohydrates: 6g | Protein: 18g | Fat: 12g | Saturated Fat: 5g | Polyunsaturated Fat: 2g | Monounsaturated Fat: 4g | Trans Fat: 0.03g | Cholesterol: 273mg | Sodium: 702mg | Potassium: 270mg | Fiber: 1g | Sugar: 4g | Vitamin A: 1460IU | Vitamin C: 36mg | Calcium: 195mg | Iron: 2mg
    L❤️VE this recipe? PIN it for later! 😊Mention @windingcreek_ranch or tag #windingcreek_ranch on IG!

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    Reader Interactions

    Comments

    1. Lynn

      December 24, 2022 at 9:18 am

      5 stars
      I've made this a few times now and always comes out perfectly. I use red, orange and green bell peppers, and top with green onions. I stir halfway through, and cook it at 355 since my oven seems to take longer to cook this. Thank you for the awesome recipe!!

      Reply
      • Jeri Walker

        December 24, 2022 at 11:49 am

        I'm so glad you like this recipe, Lynn! Thank you for sharing your tips, and thank you for coming back to rate the recipe and leaving a comment! I appreciate it! 🙂

        Reply
    2. Brenda

      June 21, 2022 at 8:11 am

      5 stars
      WONDERFUL!!! I served to weekend company (2 people that we had only met) and they couldn’t stop raving about this!!!
      Thank you for sharing!

      Reply
      • Jeri

        June 21, 2022 at 3:44 pm

        Thank you for trying our oven baked omelet casserole, Brenda. I'm so glad you and your guests enjoyed it! It's one of our favorites! Thanks for taking the time to come back and leave a comment! 🙂

        Reply
    3. Mihaela | https://theworldisanoyster.com/

      August 15, 2021 at 3:21 am

      5 stars
      I used to make oven-baked omelettes (when I had more time at hand, LOL), and spinach and courgettes were always among the ingredients. Broccoli too, since my fussy eater likes it, paradoxically:) You just reminded me how nicely they turn up!

      Reply
    4. Jean

      August 14, 2021 at 11:38 pm

      5 stars
      when I first saw the photo I knew it already looks delicious and can be served on occasions too!

      Reply
    5. Nora

      July 28, 2021 at 9:57 am

      5 stars
      Yum! This looks so delicious! Can't wait to try it out and have a bite! Thank you for sharing!

      Reply
    6. Freya

      July 28, 2021 at 9:06 am

      5 stars
      How delicious and cheesy this looks! And so easy too!

      Reply
    7. Kay

      July 28, 2021 at 3:41 am

      5 stars
      A great recipe that even my fussy eater daughter enjoyed! Is now a weekly meal in our house.

      Reply
    8. Amy

      July 28, 2021 at 1:33 am

      5 stars
      This was such a great idea and honestly, so much easier, especially when I'm feeding quite a few people. I especially loved it because it enabled me to get rid of some of the vegetables that were in the fridge. They were fluffy as you said and you're right, high in protein and low in carbs is such an added bonus.

      Reply
    9. Linda

      July 27, 2021 at 9:31 pm

      5 stars
      This omelet casserole is delicious! So flavorful and easy to prep and clean up.

      Reply

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    Hi, I'm Jeri!

    I'm a passionate home cook who loves creating easy and delicious recipes for busy families! My goal is to help you make tasty meals quickly so you can spend more time on what matters most-- family!

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