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An uncooked breakfast casserole ready to be baked, showing various ingredients layered.

Savory Sausage & Cheddar Breakfast Casserole You Prep the Night Before

Prepare this delicious savory breakfast casserole the night before for an easy morning meal. It features sausage, cheddar cheese, bread, and eggs, perfect for feeding a crowd.
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Prep Time 20 minutes
Cook Time 40 minutes
Total Time 1 hour
Servings 8 slices
Calories 400 kcal

Equipment

  • 9x13 inch baking dish
  • large bowl
  • whisk

Ingredients
  

Main Ingredients

  • 1 pound breakfast sausage cooked and crumbled
  • 6-8 slices day-old bread, cubed sourdough or brioche recommended
  • 1 cup chopped bell pepper any color
  • 1/2 cup chopped onion
  • 2 cups shredded sharp cheddar cheese
  • 8 large eggs
  • 1.5 cups milk whole or 2%
  • 1 teaspoon Dijon mustard
  • 1/2 teaspoon salt
  • 1/4 teaspoon black pepper
  • 1/4 teaspoon garlic powder

Garnish & Serving (Optional)

  • fresh chives for garnish
  • hot sauce for serving

Instructions
 

Preparation (Night Before)

  • Lightly grease a 9x13 inch baking dish.
  • Scatter the cubed day-old bread evenly across the bottom of the prepared dish.
  • Distribute the cooked sausage, bell pepper, and onion over the bread.
  • Sprinkle 1.5 cups of shredded cheddar cheese over the sausage and vegetable mixture.
  • In a large bowl, whisk together the eggs, milk, Dijon mustard, salt, black pepper, and garlic powder.
  • Carefully pour the egg mixture over all ingredients, ensuring the bread is well-saturated; gently press down any floating ingredients.
  • Cover the baking dish tightly and refrigerate for 8 to 24 hours.

Baking (Next Morning)

  • Preheat your oven to 350°F (175°C) the next morning.
  • Remove the casserole from the refrigerator and let it sit at room temperature for 20-30 minutes while the oven preheats.
  • Uncover and sprinkle the remaining 1/2 cup of shredded cheddar cheese on top.
  • Bake for 30-40 minutes, uncovered, until golden brown and the center is set; tent with foil if browning too quickly.
  • Let the casserole rest for 5-10 minutes before slicing and serving.
  • Garnish with fresh chives and serve with hot sauce, if desired.

Notes

For best results, allow the casserole to chill for the full 24 hours for maximum flavor absorption. You can customize the vegetables to your liking, such as adding mushrooms or spinach. Ensure your bread is truly day-old or slightly stale to prevent it from getting too soggy.