Increase heat to medium-high. In same skillet, crumble sausage; cook 4 to 5 minutes, stirring frequently, until no longer pink. Add 1 tablespoon of the flour, stirring constantly, until brown. Stir in remaining tablespoon flour. Stir in milk with wire whisk. Cook about 3 minutes, stirring constantly, until mixture thickens. Stir in onion salt, black pepper and cayenne pepper.