Preheat oven to 350°F (175°C). Spray a 13 x 9-inch glass baking dish with cooking spray.

In a medium pot, cook the sausage over medium heat until browned. Transfer sausage to the baking dish. Blot excess grease with a paper towel.

Add butter to the pot with sausage drippings and melt over medium heat. Stir in flour, salt, black pepper, and cayenne pepper. Cook 2–3 minutes until lightly browned to form a roux.

Slowly whisk in the milk, a little at a time, until smooth. Continue cooking on medium-low heat, stirring often, until thickened. Pour the gravy evenly over the sausage in the dish.

Cut each biscuit into fourths, or divide homemade dough into small portions. Arrange biscuit pieces evenly over the gravy.

Bake for 25–30 minutes, until biscuits are golden brown and cooked through. Serve warm.