Make Ahead Sausage Casserole

If you’re looking for a breakfast recipe that is hearty, easy, and feeds the whole family without stress, this Make Ahead Sausage Casserole is exactly what you need! It’s perfect for busy mornings, weekend brunch, or holiday breakfasts when you want something warm and comforting without cooking everything at the last minute. This casserole is packed with savory breakfast sausage, tender hashbrown potatoes, green chilis for a flavor boost, and melty cheddar cheese — all held together with a rich, fluffy egg mixture. The best part? You can assemble it the night before and simply bake it in the morning!

Ingredients

2 lbs. ground breakfast sausage
2 lbs. frozen hashbrown potatoes
2 cups shredded cheddar cheese
9 large eggs
2 cups milk
1 can diced green chilis, drained
1 tsp garlic powder
½ tsp onion powder
Salt and pepper, to taste

How to Make Make Ahead Sausage Casserole

Step 1 – Preheat the Oven: Set your oven to 350°F (175°C). Lightly grease a 9×13 inch baking dish with non-stick spray, butter, or oil. Step 2 – Cook the Sausage: In a large skillet over medium-high heat, cook the breakfast sausage until fully browned. Break it apart as it cooks. Drain any excess grease and set aside. Step 3 – Prepare the Hashbrowns: Using the same skillet, heat the frozen hashbrowns until lightly browned and mostly thawed — about 8 to 10 minutes. This helps them cook evenly in the oven. Step 4 – Assemble the Casserole: Spread the browned hashbrowns evenly in the bottom of the prepared casserole dish. Layer the cooked sausage over the potatoes. Sprinkle the shredded cheddar cheese over the sausage, then add the drained green chilis on top. Step 5 – Make the Egg Mixture: In a large bowl, whisk together the eggs, milk, garlic powder, onion powder, and salt & pepper. Stir until well combined. Step 6 – Pour & Bake: Pour the egg mixture evenly over the assembled casserole. Place it in the oven and bake, uncovered, for 35–40 minutes, or until the eggs are fully set and the top is lightly golden.

Make-Ahead Instructions

This casserole is designed to be prepped ahead! Simply assemble everything in the baking dish, cover, and refrigerate overnight. In the morning, bake as directed — you may need to add an extra 5–10 minutes if baking straight from the fridge.

Serving Suggestions

Serve with fresh fruit or berries
Add salsa or hot sauce for a spicy kick
Serve with biscuits or toast
Top with green onions or fresh parsley

Storage

Store cooled leftovers in an airtight container in the refrigerator for up to 4 days. Reheat in the microwave or oven. This Make Ahead Sausage Casserole is a family favorite for a reason — it’s warm, hearty, delicious, and perfect for meal prep. Enjoy!