In A Skillet Over Medium Heat, Cook Sausage And Onion Until The Meat Is No Longer Pink; Drain. Stir In Pizza Sauce, Salsa And Cayenne If Desired; Cook And Stir For 5 Minutes. Place Buns, Cut Side Up, On Baking Sheets. Broil 4 In. From The Heat Until Lightly Toasted. Spread About 3 Tablespoons Sausage Mixture Over Each Bun Half. Sprinkle With Cheese. Broil For 2-3 Minutes Or Until Cheese Is Melted And Lightly Browned.