Grease a 9×13 baking dish. Arrange hashbrown patties in a single layer. (I cut a hashbrown in half to fir them all the way across)
Sprinkle cooked sausage on top.
Whisk together eggs, milk, sour cream, and seasonings. Pour evenly over the casserole.
Sprinkle over the shredded cheese.
Cover and refrigerate overnight.
In the morning, preheat oven to 350°F.
Bake, uncovered, 45–55 minutes or until center is set.
Rest 10 minutes before slicing. Enjoy!
Serve this breakfast casserole with fresh fruit, a simple green salad, or a side of biscuits. It’s also great with hot sauce, salsa, or a drizzle of maple syrup for that sweet-and-savory vibe.