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A healthy egg breakfast casserole baked with colorful vegetables.

Classic Healthy Egg Breakfast Casserole

This healthy egg breakfast casserole is packed with vegetables and lean protein, making it a delicious and nutritious way to start your day. It is easily customizable and perfect for meal prep.
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Prep Time 15 minutes
Cook Time 40 minutes
Total Time 55 minutes
Servings 6 slices
Calories 200 kcal

Equipment

  • Oven
  • Baking dish
  • Skillet
  • Large bowl

Ingredients
  

Main Ingredients

  • 10-12 eggs large eggs
  • 1/2 cup milk any kind, dairy or non-dairy unsweetened
  • 1-2 cups chopped mixed vegetables e.g., bell peppers, onions, spinach, mushrooms, zucchini
  • 1/2 cup cooked and crumbled lean turkey sausage, diced lean ham, or cooked chicken breast optional
  • 1/4 cup shredded low-fat cheddar, mozzarella, or feta cheese optional

Seasoning & Garnish

  • Olive oil or cooking spray
  • Salt and black pepper to taste
  • 1/2 teaspoon garlic powder or onion powder optional
  • 1 tablespoon fresh herbs, chopped e.g., chives, parsley, or dill, for garnish

Instructions
 

Preparation

  • Preheat your oven to 375°F (190°C) and lightly grease a 9x13 inch (or 8x8 inch) baking dish with olive oil or cooking spray.
  • Heat a skillet with olive oil over medium heat, then sauté onions and bell peppers for 3-5 minutes until softened.
  • Add any other harder vegetables like mushrooms or zucchini and cook for another 3-4 minutes; if using spinach, add it last and cook until just wilted, then remove from heat.
  • In a large bowl, whisk together eggs, milk, salt, pepper, and optional garlic or onion powder until well combined and slightly frothy.

Assembly & Baking

  • Spread the sautéed vegetables evenly across the bottom of the prepared baking dish.
  • If using, sprinkle cooked lean protein and cheese over the vegetables.
  • Carefully pour the whisked egg mixture over the vegetables and other fillings, ensuring even distribution.
  • Bake in the preheated oven for 30-40 minutes (25-30 minutes for an 8x8 dish) until the center is set and the top is lightly golden.

Serving

  • Remove the casserole from the oven and let it rest for 5-10 minutes before slicing and serving.
  • Garnish with fresh herbs if desired.

Notes

This casserole is very versatile; feel free to customize the vegetables and protein based on your preferences. To make it ahead of time, assemble the casserole the night before and store it in the refrigerator. Bake as directed in the morning. This recipe is also great for meal prepping, providing healthy breakfast options for several days.