Serve it tonight: Preheat oven to 350°. Brown ground beef in a large skillet; drain. Slice each bread loaf in half, lengthwise; place on an ungreased baking sheet. Top with sliced cheese, then beef, mushrooms, onions and jalapenos, if desired. Combine next 2 ingredients; spoon over bread and sprinkle with shredded cheese. Bake 18-20 minutes or until cheese is melted. Makes 6-8 servings.
Serve it later: Assemble as directed above; wrap each loaf in foil and freeze. Unwrap and thaw completely. Bake as directed above.
Suggested sides: spinach salad and dressing