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A large, hearty simple breakfast casserole, perfect for a crowd, freshly baked in a rectangular pan.

Hearty Sausage & Veggie Breakfast Casserole

This hearty breakfast casserole is packed with savory sausage, fresh vegetables, and cheesy goodness, perfect for feeding a crowd or for meal prepping. Enjoy a delicious and easy-to-make breakfast that will keep you full and satisfied.
Prep Time 25 minutes
Cook Time 1 hour
Total Time 1 hour 25 minutes
Servings 8 people
Calories 450 kcal

Equipment

  • 9x13 inch baking dish
  • Skillet
  • Large bowl
  • Whisk
  • Aluminum foil

Ingredients
  

Main Ingredients

  • 10-12 slices stale bread, cubed (challah or brioche recommended for richness)
  • 1 pound breakfast sausage, cooked and crumbled
  • 12 large eggs, beaten
  • 2 cups whole milk
  • 2 cups shredded sharp cheddar cheese, divided
  • 1/2 cup finely chopped yellow onion
  • 1/2 cup finely chopped red bell pepper
  • 1 teaspoon salt
  • 1/2 teaspoon black pepper
  • garlic powder (optional) Pinch of
  • dried mustard (optional) Pinch of

Instructions
 

Preparation

  • Lightly grease a 9x13 inch baking dish and spread the cubed stale bread evenly over the bottom.
  • In a skillet, cook the breakfast sausage until browned and crumbled; drain any excess grease. Sauté the chopped onion and bell pepper in the same skillet until softened.
  • Scatter the cooked sausage, sautéed onion, and bell pepper over the bread cubes in the baking dish.
  • In a large bowl, whisk together the eggs, milk, salt, black pepper, and optional seasonings until well combined.
  • Pour the egg mixture evenly over the bread and sausage layers, ensuring all the bread is moistened.
  • Sprinkle 1 1/2 cups of the shredded cheese over the top.
  • Cover the dish and refrigerate for at least 4 hours, or preferably overnight, to allow the bread to soak up the liquid.

Baking

  • Preheat your oven to 375°F (190°C) when ready to bake.
  • Remove the casserole from the refrigerator, uncover, and let sit at room temperature for 15-20 minutes.
  • Sprinkle the remaining 1/2 cup of shredded cheese over the casserole.
  • Bake for 50-60 minutes, or until the casserole is set in the center and golden brown on top.
  • Let the casserole rest for 5-10 minutes before slicing and serving.

Notes

For best results, prepare the casserole the night before so the bread has ample time to absorb the egg mixture, resulting in a more custardy texture. If the top browns too quickly during baking, loosely tent it with aluminum foil to prevent burning.