Preheat your oven to a warm 425°F.
Begin by gathering a greased 9-x-13-inch baking dish. Line the bottom with the biscuit dough, firmly pressing to seal. This will be our delightful bottom crust.
Now, sprinkle the delicious sausage and cheeses generously over the crust.
In a medium-sized bowl, whisk together the beaten eggs, milk, and a dash of salt and pepper. Mix until all ingredients are blended beautifully. Pour this mixture over the sausage and cheeses in your baking dish.
Bake your casserole for 25–30 minutes—wait until it sets and the middle is firm, not jiggly. Allow it to rest for 5 minutes before cutting it into squares. Serve warm and watch the smiles!