Cook biscuits according to package directions.

Heat a large skillet to medium-high heat. Add sausage and cook while breaking up into chunks with a spatula until browned and no longer pink. Add butter and cook until it has melted. Whisk in the flour, salt and pepper and cayenne pepper if using. Cook for 1 minute. Whisk in the milk, a little at a time, cook until the mixture thickens stirring constantly.

Serve gravy over the warm biscuits.