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A healthy egg breakfast casserole baked with colorful vegetables.

Classic Healthy Egg Breakfast Casserole

This classic healthy egg breakfast casserole is a delicious and easy way to start your day. Packed with vegetables and protein, it's perfect for a wholesome meal.
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Prep Time 15 minutes
Cook Time 35 minutes
Total Time 50 minutes
Servings 6 slices
Calories 250 kcal

Equipment

  • Baking Dish
  • Skillet
  • Large Bowl
  • Whisk
  • Knife

Ingredients
  

Main Ingredients

  • 12 large eggs
  • 1/2 cup milk (dairy or non-dairy)
  • 1 tablespoon olive oil or avocado oil
  • 1 cup chopped bell peppers (any color)
  • 1/2 cup chopped onion
  • 1 cup chopped spinach or kale
  • 1/2 cup cooked lean protein (e.g., diced ham, cooked sausage, shredded chicken, or cooked black beans for a vegetarian option)
  • 1/2 cup shredded cheese (cheddar, Monterey Jack, or a blend are great – optional)
  • Salt to taste
  • Freshly ground black pepper to taste

Optional Seasonings

  • 1/2 teaspoon garlic powder
  • 1/4 teaspoon dried oregano
  • red pepper flakes a pinch

Instructions
 

Preparation

  • Preheat your oven to 375°F (190°C).
  • Lightly grease a 9x13 inch baking dish (or an 8x8 inch dish for a thicker casserole) with cooking spray or a little olive oil.

Cooking the Vegetables

  • Heat the olive oil in a large skillet over medium heat.
  • Add the chopped bell peppers and onion and cook for 5-7 minutes until softened.
  • Stir in the spinach or kale and cook for another 2-3 minutes until wilted.
  • Remove from heat.

Mixing the Eggs

  • In a large bowl, whisk the eggs and milk together until well combined.
  • Season generously with salt, pepper, garlic powder, and oregano (if using).

Assembling the Casserole

  • Spread the sautéed vegetables and your cooked protein evenly over the bottom of the prepared baking dish.
  • If using cheese, sprinkle about half of it over the veggie and protein layer.
  • Carefully pour the egg mixture over the vegetables and protein in the baking dish.
  • Gently shake the dish to ensure the eggs are evenly distributed.
  • Sprinkle the remaining cheese (if using) over the top.

Baking and Serving

  • Place the baking dish in the preheated oven and bake for 30-35 minutes, or until the center is set and the top is lightly golden.
  • A knife inserted into the center should come out clean.
  • Once out of the oven, let the casserole rest for 5-10 minutes before slicing and serving.

Notes

For meal prep, you can bake this casserole ahead of time and store individual portions in the refrigerator for up to 3-4 days. Reheat in the microwave or oven. Alternatively, assemble the casserole the night before and store in the refrigerator. In the morning, simply pop it in the oven for a quick breakfast.