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Healthy Overnight Breakfast Casserole

9 Powerful Reasons to Love This Healthy Overnight Breakfast Casserole

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  • Author: Maria
  • Prep Time: 15 minutes
  • Cook Time: 50 minutes
  • Total Time: 1 hour 5 minutes
  • Yield: 8 servings 1x
  • Category: breakfast
  • Method: Baking
  • Cuisine: American

Description

This Healthy Overnight Breakfast Casserole is a veggie-packed, protein-rich morning favorite you can prep the night before. With wholesome ingredients and bold flavor, it’s perfect for holiday brunches, meal prep, or any busy morning.


Ingredients

Scale
  • 6 slices whole grain or sprouted bread, cubed (about 200g)

  • 6 large eggs

  • 1 ½ cups unsweetened almond milk (or milk of choice)

  • 1 cup chopped spinach (fresh or frozen, thawed)

  • 1 cup diced red bell pepper

  • ½ cup chopped onions

  • 1 cup low-fat shredded cheddar cheese

  • 1 cup cooked turkey sausage or vegetarian sausage, chopped

  • ½ teaspoon garlic powder

  • ½ teaspoon onion powder

  • Salt and pepper to taste

  • Optional add-ins: chopped mushrooms, kale, or cherry tomatoes


Instructions

  • Prepare Dish: Grease a 9×13-inch baking dish with nonstick spray.

  • Layer Ingredients: Spread cubed bread on the bottom. Layer turkey sausage, spinach, peppers, onions, and cheese on top.

  • Mix Egg Base: In a bowl, whisk eggs, almond milk, garlic powder, onion powder, salt, and pepper.

  • Assemble: Pour egg mixture evenly over casserole. Lightly press down to help absorption.

  • Refrigerate: Cover with foil or plastic wrap and refrigerate overnight.

  • Bake: Preheat oven to 350°F (175°C). Bake uncovered for 45–50 minutes until set and golden.

 

  • Serve: Cool slightly before slicing. Garnish with fresh herbs if desired.


Notes

  • Use day-old bread for best texture.

  • Sauté vegetables before layering for extra flavor.

  • Can be made 1–2 days ahead and kept covered in the fridge.

 

  • Great for freezing in individual portions.