Hashbrown Breakfast Casserole (Easy Make-Ahead Brunch)

Golden, cheesy and crispy around the edges, this Hashbrown Breakfast Casserole is the make-ahead breakfast that feeds a crowd with almost no effort. Shredded hash browns, savory sausage, fluffy eggs and plenty of sharp cheddar bake together in one 9×13 dish, so you can slice it into squares and let everyone help themselves.

It’s a go-to for holiday mornings, brunch with friends or a big weekend breakfast, and you can assemble it the night before. If you love hearty mornings, try my protein-packed breakfasts next, or pair a slice with one of these healthy breakfast bowls for a lighter option.

Why You’ll Love This Hashbrown Casserole

• Feeds a crowd. One pan makes 10 to 12 generous squares.
• Make-ahead friendly. Assemble it the night before, then bake in the morning.
• Crispy and creamy at once. The edges turn golden while the middle stays soft and custardy.
• Easy to customize. Swap in bacon, ham, peppers or spinach with no extra steps.

Ingredients You’ll Need

• Frozen shredded hash browns: A 30 oz bag. Thaw and squeeze out moisture with a clean towel so the casserole isn’t soggy.
• Breakfast sausage: Pork sausage gives the most flavor. Turkey sausage works for a lighter dish.
• Eggs: A full dozen sets the casserole and makes it filling.
• Milk: Whole milk makes the egg custard tender. Half-and-half makes it richer.
• Sharp cheddar: Shred it from a block for the smoothest melt.
• Onion and bell pepper: Optional, but they add sweetness and color.
• Seasonings: Garlic powder, smoked paprika, salt, pepper and a pinch of dry mustard.
• Green onions or chives: A fresh finish on top.

How to Make Hashbrown Breakfast Casserole

1. Prep the pan. Heat the oven to 350°F and grease a 9×13-inch baking dish.
2. Brown the sausage. Cook the sausage with the onion and pepper in a skillet over medium heat, breaking it into crumbles, until no pink remains. Drain the grease.
3. Layer. Spread the dried hash browns in the dish. Top with the sausage mixture and two-thirds of the cheese.
4. Whisk the eggs. Whisk eggs, milk and seasonings until smooth, then pour evenly over the top. Press down gently so everything soaks.
5. Bake. Cover with foil and bake 35 minutes. Uncover, add the rest of the cheese and bake 20 to 25 minutes more, until the center is set and the top is golden.
6. Rest and slice. Let it rest 10 minutes so it slices cleanly. Sprinkle with green onions and serve.

Tips for the Best Breakfast Casserole

• Dry the hash browns well. Extra water is the number one cause of a soggy casserole.
• Check the center. A knife inserted in the middle should come out clean, or the center should read 160°F.
• Want crispier edges? Use a metal pan and bake the last 10 minutes uncovered on the upper rack.
• Making it overnight? Add 10 to 15 minutes to the covered bake time since it goes in cold.

What to Serve With It

Serve squares with fresh fruit, a yogurt parfait, warm biscuits or a simple green salad for brunch. A big pot of coffee or a pitcher of orange juice rounds it out. For a cozy dinner-style spread later in the day, a cup of crockpot broccoli cheddar soup is a great match.

Storage and Reheating

Cover leftovers and refrigerate for up to 4 days. Reheat single squares in the microwave for 60 to 90 seconds, or warm the whole dish covered at 325°F for about 20 minutes. To freeze, wrap cooled squares individually and freeze up to 2 months; thaw overnight in the fridge before reheating.

Frequently Asked Questions

Can I make this breakfast casserole the night before?

Yes. Assemble it completely, cover tightly and refrigerate up to 24 hours. Bake straight from the fridge, adding 10 to 15 minutes to the covered bake time.

Do I need to thaw the hash browns?

Thawing and patting them dry gives the best texture. If you’re short on time, you can use them frozen, but bake about 15 minutes longer and expect a slightly softer casserole.

Can I use bacon or ham instead of sausage?

Absolutely. Use 12 oz of cooked, crumbled bacon or 2 cups of diced ham. Both work without changing the rest of the recipe.

Why is my casserole watery?

Usually the hash browns weren’t dried, or watery vegetables like mushrooms or spinach went in raw. Squeeze the potatoes and sauté any veggies first.

More Easy Recipes You’ll Love

• 5 Easy Protein-Packed Breakfasts
• Healthy Breakfast Bowls
• Chicken Pot Pie Casserole
• Homemade Green Bean Casserole
• Healthier Pumpkin Bread

Hashbrown Breakfast Casserole Recipe

Prep: 20 min | Cook: 55–60 min | Servings: 12

Ingredients

• 1 (30 oz) bag frozen shredded hash browns, thawed and patted dry
• 1 lb breakfast sausage
• 1 small yellow onion, diced
• 1 red bell pepper, diced (optional)
• 12 large eggs
• 1 ½ cups whole milk
• 1 tsp garlic powder
• ½ tsp smoked paprika
• ½ tsp dry mustard
• 1 tsp salt
• ½ tsp black pepper
• 2 ½ cups (10 oz) sharp cheddar, shredded, divided
• 3 green onions, sliced

Instructions

1. Heat oven to 350°F. Grease a 9×13-inch baking dish.
2. Brown the sausage with onion and bell pepper until cooked through. Drain.
3. Spread hash browns in the dish. Top with sausage mixture and 1 ¾ cups cheddar.
4. Whisk eggs, milk and seasonings. Pour evenly over the casserole.
5. Cover with foil and bake 35 minutes. Uncover, top with remaining cheese and bake 20–25 minutes more until set and golden.
6. Rest 10 minutes, sprinkle with green onions, slice and serve.

Nutrition (estimated, per serving): about 340 calories, 17 g protein, 16 g carbs, 1 g fiber, 23 g fat.

Planning a holiday brunch? Save this casserole to your Pinterest breakfast board so it’s ready when you need it!