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Veggie Egg Breakfast Casserole

Veggie egg breakfast casserole slice with peppers, mushrooms, and melted cheese.
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This budget-friendly casserole transforms a dozen eggs and seasonal vegetables into a hearty, make-ahead meal. Perfect for weekend brunch or easy weekday breakfasts, it bakes up golden and puffy, offering a protein-packed start to the day.

Ingredients

Scale
  • 12 large eggs
  • 1 cup whole milk
  • 1 cup shredded sharp cheddar cheese, divided
  • 1/2 cup grated Parmesan cheese
  • 1 tablespoon Dijon mustard
  • 1 teaspoon garlic powder
  • 1 teaspoon dried oregano
  • 1/2 teaspoon smoked paprika
  • 1/2 teaspoon salt
  • 1/4 teaspoon black pepper
  • 1 tablespoon olive oil
  • 1 medium yellow onion, diced
  • 1 red bell pepper, diced
  • 2 cups chopped fresh spinach
  • 8 ounces cremini mushrooms, sliced
  • 3 cups day-old bread, cubed

Instructions

  1. Preheat oven to 350°F (175°C).
  2. Heat olive oil in a large skillet over medium heat. Add onion and bell pepper; cook 4-5 minutes until softening.
  3. Add mushrooms to skillet; cook 5-7 minutes until browned.
  4. Stir in spinach until wilted, about 1 minute. Remove from heat and cool slightly.
  5. In a large bowl, whisk eggs, milk, mustard, garlic powder, oregano, paprika, salt, and pepper until smooth.
  6. Whisk in 3/4 cup cheddar and all Parmesan cheese.
  7. Grease a 9×13 inch baking dish. Spread bread cubes evenly in dish.
  8. Scatter sautéed vegetables over the bread.
  9. Pour egg mixture over everything, pressing gently with a spatula so bread soaks up custard.
  10. Sprinkle remaining 1/4 cup cheddar on top.
  11. Bake 45-50 minutes, until top is golden, center is set, and a knife inserted comes out clean.
  12. Let casserole rest 5-10 minutes before slicing and serving.

Notes

For a make-ahead meal, assemble the casserole, cover, and refrigerate overnight before baking. Use day-old bread for best texture; fresh bread can become gummy. Customize with your favorite vegetables like broccoli, zucchini, or asparagus.

Nutrition

Find it online: https://harmonymeal.com/veggie-egg-breakfast-casserole/