Preheat Your Oven: Set your oven to 350°F (175°C) and lightly grease your baking dish.
Cook the Sausage: In a skillet, brown the sausage over medium heat, breaking it into crumbles. Drain excess grease and set aside.
Layer the Hashbrowns: Spread the hashbrowns evenly across the bottom of the prepared baking dish.
Add the Sausage and Cheese: Sprinkle the cooked sausage over the hashbrowns, followed by the shredded cheddar cheese.
Prepare the Egg Mixture: In a mixing bowl, whisk together the eggs, milk, salt, and pepper. Pour this mixture evenly over the sausage and cheese layer.
Top with Biscuits: Cut the biscuits into quarters and arrange them over the top of the casserole.
Bake: Cover the dish with aluminum foil and bake for 30 minutes. Remove the foil, pour sausage gravy over the biscuits, and bake for an additional 15 minutes or until biscuits are golden and cooked through.