This easy hashbrown breakfast casserole combines thawed frozen shredded potatoes, browned breakfast sausage, fluffy eggs, milk, and plenty of cheddar cheese in one comforting 9-by-13-inch dish. Prep takes just 15–20 minutes, and the casserole bakes uncovered at 350°F for 45–55 minutes, making it a practical choice for weekends, holidays, brunch gatherings, and make-ahead breakfasts.
Every serving has crisp-edged potatoes, tender egg custard, savory sausage, and a bubbling layer of melted cheddar. Let the casserole rest for 5–10 minutes after baking so it slices neatly while staying warm and creamy inside.
Jump to RecipeWhy You’ll Love This Recipe
This casserole has everything a satisfying breakfast needs in one pan. The potatoes provide a crisp, hearty base, while the eggs hold the sausage and cheese together in soft, savory layers.
It is also a generous recipe for a busy household or brunch table. Once the dish is assembled, the oven does most of the work, leaving you free to prepare coffee, fruit, toast, or a simple green salad.
- Easy preparation: The ingredients are familiar and require only a skillet, bowl, and baking dish.
- Family-friendly flavor: Cheddar and sausage create a classic combination that appeals to both children and adults.
- Flexible ingredients: Use bacon instead of sausage, or add onion, bell pepper, mushrooms, or spinach.
- Make-ahead convenience: Assemble it the night before and bake it in the morning.
If you enjoy hearty morning dishes, you may also like this easy breakfast casserole for another comforting option.
Ingredients You’ll Need
The foundation of this recipe is a full 30-ounce package of frozen shredded hash brown potatoes. Thaw them completely and drain away excess moisture before assembling the casserole; wet potatoes can release water into the eggs and keep the top from browning properly.
Breakfast sausage adds savory seasoning and a little richness throughout the dish. Brown it until no pink remains, then drain excess fat so the finished casserole tastes balanced rather than greasy.
Eight large eggs and one cup of whole or 2% milk create the soft custard that binds the layers. Whole milk gives a slightly richer texture, while 2% milk keeps the result lighter without changing the basic method.
Use 1½ cups shredded cheddar cheese, adding about 1 cup inside the casserole and the remaining ½ cup on top. Freshly shredded cheese melts especially well, but a convenient pre-shredded blend also works.
The basic seasoning is simple: ½ teaspoon salt and ¼ teaspoon black pepper. For extra flavor, stir 1 teaspoon Dijon mustard or dry mustard into the egg mixture, or add ½ cup diced onion or bell pepper to the sausage while it cooks.
How to Make It Step-by-Step
Step 1: Heat your oven to 350°F (175°C), then grease a 9-by-13-inch baking dish with cooking spray or 1 tablespoon butter. Greasing the dish helps the edges release easily and makes serving much less messy.
Step 2: Cook the breakfast sausage in a skillet over medium heat until it is fully browned and no longer pink. Break it into small crumbles as it cooks, drain excess fat, and sauté the optional onion or bell pepper until slightly softened.
Step 3: Spread the thawed hash browns across the bottom of the prepared baking dish. Press them into an even layer without packing them too firmly, since a loose layer allows the egg mixture to move through the potatoes.
Step 4: Sprinkle the cooked sausage and any sautéed vegetables evenly over the potatoes. Add about 1 cup of the shredded cheddar, distributing it from corner to corner so each serving receives a little cheese.
Step 5: Crack the eggs into a mixing bowl and whisk in the milk, salt, and black pepper. Continue whisking until the yolks and whites are fully blended, then pour the mixture slowly and evenly over the casserole.
Step 6: Sprinkle the remaining ½ cup of cheddar over the top. This final layer melts into a golden, bubbling blanket while the eggs cook underneath.
Step 7: Bake the casserole uncovered for 45–55 minutes. It is ready when the center is set, the eggs are no longer wet, and the internal temperature is about 160°F.
Step 8: Remove the dish from the oven and let it stand for 5–10 minutes before slicing. This short rest allows the custard to firm slightly, so the portions hold their shape instead of spreading across the plate.
For another savory dish that works well for a relaxed family meal, try this easy Big Mac casserole later in the day.
Chef Tips for the Best Casserole
The most important preparation detail is handling the frozen potatoes correctly. Thaw them in the refrigerator or according to the package directions, then drain and gently pat them dry with paper towels before adding them to the dish.
Do not cover the casserole while it bakes. An uncovered dish allows moisture to escape and gives the cheese a golden finish, while covering it can leave the potatoes softer and the center wetter.
Try to pour the egg mixture over the entire surface instead of dumping it in one spot. Even pouring helps the custard reach the potatoes and sausage throughout the baking dish.
For a meatless version, omit the sausage and add sautéed onion, bell pepper, mushrooms, or spinach. Cook vegetables first so they release some moisture before going into the casserole.
Cheddar is the classic choice, but Monterey Jack, Colby, pepper Jack, or a cheddar blend can be substituted. Pepper Jack adds gentle heat, while Monterey Jack creates a particularly smooth, melty topping.
For a smaller casserole, use 20 ounces of frozen hash browns, 6 eggs, and ¾ cup milk. The full recipe below is sized for a 9-by-13-inch dish, while the smaller variation is useful for a more compact gathering.
Make-Ahead, Storage, and Reheating
To prepare this casserole in advance, assemble it completely, cover the baking dish, and refrigerate it overnight. Before baking, let it sit at room temperature for about 20–30 minutes, then bake as directed and add roughly 5–10 minutes if the center needs more time.
Because the dish begins cold from the refrigerator, rely on doneness rather than the clock alone. The middle should be set, the eggs should not look wet, and the internal temperature should be about 160°F.
Cool leftover portions promptly and refrigerate them in a covered container. Reheat individual squares in the microwave until hot, or warm several portions in a baking dish until heated through.
For a different overnight breakfast approach, consider this ham and cheddar slow-cooker breakfast. It offers the same cozy breakfast spirit with a different cooking method.
What to Serve with Hashbrown Casserole
This casserole is filling enough to serve on its own, but fresh sides make the meal feel complete. A bowl of berries, sliced melon, or orange wedges brings brightness to the rich sausage, eggs, potatoes, and cheese.
For a larger brunch, add fresh coffee, tea, fruit juice, and a simple baked item. Our easy beer bread can make a hearty accompaniment when you want something warm and sliceable on the table.
- Fresh berries or melon
- Sliced tomatoes or avocado
- Plain yogurt with fruit
- Toast, muffins, or warm bread
- Hot sauce or salsa for serving
Set out hot sauce, salsa, or sliced green onions so guests can finish their portions to taste. A little fresh parsley also adds color without changing the casserole’s familiar flavor.
Easy Hashbrown Breakfast Casserole Recipe
Ingredients
Method
- Heat the oven to 350°F (175°C), then grease a 9-by-13-inch baking dish with cooking spray or 1 tablespoon butter.
- Cook the breakfast sausage in a skillet over medium heat until it is no longer pink and is fully browned. Drain excess fat, and sauté the optional onion or bell pepper until slightly softened.
- Spread the thawed and drained hash browns evenly across the bottom of the prepared baking dish.
- Sprinkle the cooked sausage, optional vegetables, and about 1 cup of the shredded cheddar over the potatoes.
- Whisk the eggs, milk, salt, and black pepper in a bowl until combined. Pour the egg mixture evenly over the potatoes, sausage, vegetables, and cheese.
- Scatter the remaining 1/2 cup cheddar over the top of the casserole.
- Bake uncovered for 45–55 minutes, until the center is set, the eggs are no longer wet, and the internal temperature reaches about 160°F.
- Let the casserole stand for 5–10 minutes before cutting into squares and serving.
Notes
Final Thoughts
This easy hashbrown breakfast casserole is a dependable recipe for feeding a crowd without spending the whole morning at the stove. With frozen shredded potatoes, browned sausage, eggs, milk, and cheddar, it delivers a warm and satisfying breakfast from a short ingredient list.
Remember to thaw and drain the hash browns, bake the dish uncovered at 350°F for 45–55 minutes, and let it rest for 5–10 minutes before slicing. Prepare it overnight when you want a relaxed morning meal, or assemble and bake it right away for a comforting weekend breakfast.
Serve generous squares with fruit, coffee, and your favorite toppings. Once you try this reliable combination, it is likely to become a regular part of your breakfast and brunch rotation.
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