1-First step: Preheat and prep the pan Start by heating your oven to 350°F. Lightly spray a 9×13-inch baking pan with cooking spray so the casserole releases easily after baking. This simple step helps prevent sticking and makes serving much easier later. If you know you will be baking from refrigerated casserole later in the day, this is also a good time to clear space in the fridge.

2-Second step: Cook the sausage Place the 2 pounds of hot breakfast sausage in a large skillet over medium heat. Cook it until it is no longer pink, breaking it up as it cooks. This usually takes about 8 to 10 minutes, depending on your stove and skillet size. Once cooked, drain off the fat and set the sausage aside. If you want a lighter version, turkey sausage works well here too.

3-Third step: Brown the hash browns Add the frozen shredded hash browns to the same skillet. Cook them until they are lightly browned, adding a little oil if the pan looks dry. This step is optional, but it gives the potatoes a better texture and helps them stay from turning mushy in the oven. Browning also adds a pleasant, slightly crisp bite that works really well with the soft egg layer. Once the hash browns are ready, spread them in the bottom of the prepared pan. Try to make an even layer so the casserole bakes evenly.

4-Fourth step: Layer the sausage and cheese Next, add the cooked sausage over the hash browns. Spread it out so every slice gets a good amount of meat. Then sprinkle the 2 cups of shredded cheddar cheese over the top. The cheese helps bind the layers together and adds that classic breakfast casserole flavor that people love.

5-Fifth step: Whisk the egg mixture In a medium bowl, whisk together the 8 eggs, 2 cups milk, 1 teaspoon salt, 1/2 teaspoon pepper, 1/4 teaspoon garlic powder, and 1/4 teaspoon onion powder. Whisk until the mixture looks smooth and evenly blended. This seasoned egg mixture is what holds the Sausage Hashbrown Breakfast Casserole together and gives every bite a soft, rich texture.

6-Sixth step: Pour and assemble Pour the egg mixture evenly over the sausage, cheese, and hash browns in the pan. Use a spoon or spatula if needed to gently nudge the top layer so the liquid reaches all the corners. If you are making the casserole ahead of time, cover it and refrigerate it at this stage. That makes it a strong meal-prep option for holidays, overnight guests, or busy school mornings.

7-Seventh step: Bake until set Bake the casserole uncovered for 35 to 40 minutes, or until it is set and cooked through. The center should not look wet, and the top should be lightly golden. If the casserole has been chilled in the refrigerator before baking, it may need a few extra minutes in the oven. For best results, let the casserole rest for about 10 minutes before cutting into it. This helps the layers firm up, making it easier to slice into neat portions. Serve warm and enjoy with fruit, toast, or a simple side salad if you want a fuller brunch plate.