Sausage Breakfast Casserole is an easy egg bake recipe combining hash browns, sausage, peppers, onions, and layers of cheese. This breakfast egg casserole is perfect for entertaining or Christmas morning because it can be made ahead of time!

An easy egg breakfast casserole recipe is essential around the holidays. With overnight guests, Christmas breakfast, and festive get togethers we need an egg dish to feed a crowd!

I love hash brown casserole because it’s a gluten free breakfast casserole all can enjoy. Often overnight casseroles soak eggs in bread, which isn’t allergy friendly.

Sausage egg bake layers crispy hash brown potatoes with eggs, cheese, bell peppers, onions, and flavorful breakfast sausage. However, the other great thing about this sausage, egg, and cheese casserole is how adaptable it is!

Substitute ham or bacon for the sausage or mix in any preferred veggies. This is a hearty breakfast casserole to be made and enjoyed in so many ways!

Ingredients in Sausage Egg Casserole

Breakfast Sausage – One pound of fresh pork sausage flavors this egg casserole. If preferred, substitute one pound chopped and cooked bacon or ham.
Peppers – Red peppers add color and sweetness to the dish, but any bell pepper may be used.
Onions – Chopped onions saute with the peppers. They may be omitted or sprinkle on chopped green onions when pouring on the beaten eggs.
Hash Browns – Frozen hash browns are mixed with butter, olive oil, salt, and pepper in the baking dish. The potatoes bake before adding the egg mixture to get browned and crispy.
Eggs – Whisk together 10 eggs with a little milk and pour over potatoes.
Cheese – Use any preferred shredded cheese, such as sharp, cheddar cheese, pepper jack, mozzarella, colby jack, or a mixture.

Can I Make Hash Brown Breakfast Casserole Ahead of Time?

Yes, which is why this makes the perfect Christmas Breakfast Casserole recipe!

Bake the hash brown layer the night before and cool slightly. Pour on the whisked eggs, cheese, cooked sausage, peppers, onions, and additional cheese. Cover and refrigerate overnight.

The next morning preheat the oven and bake for about 30 minutes. It will need to bake for a little longer than the recipe states since the dish chilled overnight.

How to Make Sausage Breakfast Casserole

Spread frozen potatoes on the bottom of prepared baking dish. Drizzle hash browns with butter, oil, salt, and pepper. Gently mix with a spoon.
Bake for 25 minutes, stir, and bake for 20-25 minutes more, or until edges start to brown.
While potatoes are baking, brown sausage in a nonstick skillet. Break up sausage with a wooden spoon and cook until no longer pink.
In the same skillet saute peppers and onions for 5 minutes, or until softened. Remove for heat and set aside.
In a large bowl whisk together eggs, milk, salt, and pepper. Pour eggs over partially cooked hash browns. Sprinkle on 1 cup shredded cheese, then all cooked sausage, peppers, onions, and finish with remaining cheese.
Bake in 375°F oven for 20-30 minutes, or until eggs are set.

How Long to Bake Sausage Breakfast Casserole

Bake Sausage Egg Casserole at 375ºF for 20-30 minutes. If the hash brown casserole has been refrigerated overnight, it will probably need to bake a few minutes longer.

Insert an knife in the middle to make sure the eggs are set. Then let the casserole stand about 10-15 minutes before cutting and serving.

What else Can Be Added to a Breakfast Casserole

That’s the beauty of the this easy breakfast recipe! What doesn’t go with potatoes, cheese, eggs?!

Mexican Breakfast Casserole – Substitute chorizo for the sausage, use pepper jack cheese, and sprinkle on jalapenos for a spicy kick!
Veggie Breakfast Egg Casserole – Omit the sausage and load up on the veggies, like well drained chopped spinach, peppers, mushrooms, and artichokes.
Ham and Cheese Casserole – Have leftover Christmas ham? Chop up 2-3 cups and layer with hash browns, eggs, veggies, and cheese.
Healthy Breakfast Casserole – Substitute chicken or turkey sausage and use low fat shredded cheese.

Can you freeze a Breakfast Casserole?

Yes, freeze sausage egg casserole either baked or unbaked.

Freezing Unbaked Breakfast Casserole:

Prepare the recipe as directed until ready to bake with the layers of eggs, potatoes, sausage, and cheese. Wrap tightly with plastic wrap then cover with foil. Freeze up to 2 months.

Thaw one day ahead of time in the refrigerator and bake as directed. The casserole will have to bake slightly longer since it is chilled. Insert a knife in the middle to make sure eggs are set.

Freezing Baked Sausage and Egg Casserole:

Prepare, bake as directed, and allow the sausage egg bake to cool completely. Wrap tightly with plastic wrap then cover with foil. Freeze up to 2 months.

Thaw one day ahead of time in the refrigerator. Remove plastic and cover loosely with foil. Preheat oven to 350 degrees. Bake for 20-30 minutes, or until heated through.

Leftover Breakfast Casserole:

Store leftovers in the refrigerator up to 3 days or wrap in serving sized portions and freeze up to 2 months. Reheat in the microwave at 50% power until almost heated through and then finish at full power.

What to serve with Breakfast Egg Casserole

Banana Muffins
Fruit Salad
Banana Oat Pancakes
Crepes or Waffles
Biscuits
Almond Flour Muffins
Cheese Scones
Yogurt parfaits with homemade granola

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Items used to make this recipe*:

Casserole Dish Santoku Knife Nonstick Skillet

*contains affiliate links

Sausage Breakfast Casserole