In A Large Skillet, Brown Sausage, Beef And Onion. Remove From The Heat; Drain. Remove The Centers From The Tops And Bottoms Of Each Bun. Tear Removed Bread Into Small Pieces; Add To Skillet. Set Buns Aside. Stir In Remaining Ingredients Into Sausage Mixture. Spoon About 1/3 Cupful Onto The Bottom Of Each Bun; Replace Tops. Wrap Individually In Heavy-Duty Foil. Bake At 350 Degrees F For 20 Minutes Or Until Heated Through Or Freeze For Up To 3 Months.