This High-Protein Breakfast Casserole is a hearty and satisfying dish loaded with eggs, cottage cheese, colorful vegetables, and melted cheese. It delivers a creamy texture with plenty of savory flavor in every bite. Perfect for meal prep, family brunches, or busy weekday mornings, this casserole is easy to make ahead and reheat whenever you need a nourishing breakfast.

Why You’ll Love This Recipe

• Packed with protein from eggs, cottage cheese, and shredded cheese
• Great for meal prep and make-ahead breakfasts
• Loaded with vegetables for extra nutrition and flavor
• Creamy, fluffy texture without being heavy
• Easy to customize with your favorite vegetables and cheeses
• Perfect for serving a crowd at brunch
• Naturally gluten-free and low in carbohydrates
• Reheats beautifully for quick weekday meals

Ingredients

(Tip: You’ll find the full list of ingredients and measurements in the recipe card below.)

• 2 tablespoons extra-virgin olive oil, divided
• 4 ounces sliced fresh mushrooms such as oyster or shiitake mushrooms
• 1 medium red bell pepper, chopped
• 1 small yellow onion, chopped
• 1/4 teaspoon salt, divided
• 1 package (5 ounces) baby kale
• 1 1/2 teaspoons garlic powder
• 1/4 teaspoon crushed red pepper flakes
• 8 large eggs
• 1/2 cup small-curd reduced-fat cottage cheese
• 1/3 cup whole milk
• 1 1/2 cups shredded Colby-Jack cheese, divided
• Cooking spray for greasing the baking dish

Directions

1. Preheat your oven to 350°F (175°C). Lightly grease an 8-inch square baking dish with cooking spray.
2. Heat 1 tablespoon of olive oil in a large skillet over medium-high heat. Add the sliced mushrooms and cook without stirring for about 4 minutes until browned. Stir and continue cooking for another 3 minutes until the moisture evaporates.
3. Add the chopped bell pepper, chopped onion, remaining tablespoon of olive oil, and half of the salt. Cook for about 4 minutes, stirring frequently, until softened.
4. Stir in the baby kale, garlic powder, and crushed red pepper flakes. Cook for 2 minutes until the kale wilts. Remove from heat and let the vegetable mixture cool slightly.
5. In a blender, combine the eggs, cottage cheese, milk, 3/4 cup of shredded Colby-Jack cheese, and the remaining salt. Blend on low speed for about 20 seconds until smooth and creamy.
6. Spread half of the vegetable mixture evenly into the prepared baking dish. Pour the egg mixture over the vegetables.
7. Scatter the remaining vegetable mixture on top. Sprinkle the remaining 3/4 cup shredded cheese over the casserole.
8. Bake for approximately 40 minutes, or until the casserole is puffed around the edges and golden brown on top.
9. Let the casserole rest for 10 minutes before slicing and serving.

Servings and timing

• Servings: 6 servings
• Prep Time: 25 minutes
• Cook Time: 40 minutes
• Total Time: 1 hour 15 minutes

Variations

• Replace kale with fresh spinach for a milder flavor.
• Add diced zucchini, broccoli, or tomatoes for extra vegetables.
• Swap Colby-Jack cheese with mozzarella, cheddar, or Monterey Jack.
• Add cooked turkey sausage or diced halal chicken for additional protein.
• Use feta cheese for a tangy Mediterranean-style version.
• Make it spicy by increasing the crushed red pepper flakes or adding jalapeños.
• Use ricotta cheese instead of cottage cheese for a richer texture.

Storage/Reheating

Store leftover casserole in an airtight container in the refrigerator for up to 3 days. For longer storage, wrap individual slices tightly and freeze for up to 2 months.

To reheat refrigerated slices, microwave for 1 to 2 minutes until heated through. You can also warm slices in a 350°F oven for about 10 minutes.

For frozen portions, thaw overnight in the refrigerator before reheating. This helps maintain the best texture and flavor.

FAQs

Can I make this casserole ahead of time?

Yes, you can prepare the casserole the night before and refrigerate it unbaked. Bake it fresh in the morning.

Do I need a blender for the egg mixture?

No. A whisk or hand mixer will also work, though blending creates an extra creamy texture.

Can I freeze this breakfast casserole?

Yes, it freezes very well. Store individual slices for quick breakfasts later.

What vegetables work best in this recipe?

Mushrooms, kale, spinach, broccoli, zucchini, and bell peppers all work wonderfully.

How do I know when the casserole is fully cooked?

The center should be set, and the edges should appear puffed and golden brown.

Can I use different cheese?

Absolutely. Cheddar, mozzarella, Monterey Jack, or feta are all delicious alternatives.

Is cottage cheese necessary?

Cottage cheese adds creaminess and protein, but ricotta cheese can also be used.

Can I make this dairy-free?

Yes, substitute dairy-free milk, dairy-free cheese, and a plant-based cottage cheese alternative.

Why should I precook the vegetables?

Cooking the vegetables first removes excess moisture and improves flavor.

Can I serve this for brunch?

Yes, this casserole is perfect for brunch gatherings because it feeds several people easily.

Conclusion

This High-Protein Breakfast Casserole is a delicious and wholesome way to start the day. Filled with protein-rich eggs, creamy cottage cheese, and flavorful vegetables, it offers both comfort and nutrition in every slice. Whether you prepare it for meal prep, family breakfasts, or a weekend brunch, this casserole is versatile, easy to customize, and satisfying enough to keep everyone full for hours.

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