Instructions
1. Preheat & Prep:
Preheat oven to 350°F (175°C). Grease a 9×13-inch baking dish.
2. Cook the Sausage:
Cook sausage in a skillet over medium heat until browned, breaking it up. Add onion (if using) and cook until softened (3-4 minutes). Drain excess grease.
3. Whisk the Egg Mixture:
Whisk eggs, milk, salt, pepper, and mustard (if using) in a bowl until combined.
4. Assemble the Casserole:
Layer bread in the dish. Top with sausage mixture and 1 1/2 cups cheese. Pour egg mixture over all, pressing gently. Sprinkle with remaining 1/2 cup cheese.
5. Bake:
Bake for 40-45 minutes, or until golden brown and set. A knife inserted in the center should come out clean.
6. Serve:
Cool 5 minutes before serving. Garnish with parsley (optional).
Cooking Notes
- Bread: Day-old bread works best to absorb the egg mixture without getting soggy. Experiment with different types!
- Sausage: Use your favorite! Mild, spicy, turkey—even Italian sausage works well.
- Make-Ahead: Assemble the night before, refrigerate, and bake in the morning!
Variations
- Vegetable: Add sautéed peppers, spinach, or mushrooms.
- Spicy: Use spicy sausage and add red pepper flakes.
- Biscuit: Use biscuit dough instead of bread cubes.
- Mexican: Use chorizo, green chilies, and pepper jack cheese. Serve with salsa and sour cream.
Frequently Asked Questions (FAQs)
Can I make this ahead?
Yes! Assemble the night before and refrigerate.
Can I freeze it?
Yes, before baking. Wrap tightly and freeze for up to 2 months. Thaw overnight before baking.
How to store leftovers?
Refrigerate in an airtight container for up to 3-4 days. Reheat in the microwave or oven.
What type of bread?
Day-old bread is best, but experiment!

Can I use different cheese?
Absolutely! Try mozzarella, Swiss, or pepper jack.
This Easy Breakfast Sausage Casserole is a delicious and convenient make-ahead breakfast for any occasion! Enjoy!
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