In A Skillet, Cook Beef Over Medium Heat Until No Longer Pink; Drain. Stir In Garlic Powder And Salt. Place Each Bread Half On A Large Piece Of Heavy-Duty Foil. Spread With Cheese Sauce. Top With Beef Mixture, Mushrooms, Onions And Jalapenos. Drizzle With Tomato Sauce. Top With Parmesan And Mozzarella Cheeses. Wrap And Freeze. May Be Frozen For Up To 3 Months. To Bake: Unwrap Loaves And Thaw On Baking Sheets In The Refrigerator. Bake At 350 Degrees F For 18 Minutes Or Until Cheese Is Melted.