1/4 cup Butter 2 cups sliced onions 1 medium (1 cup) green and/or red bell pepper, cut into strips 1/2 pound sliced deli roast beef, cut into strips 4 hoagie or French rolls, split 8 slices (3/4-ounce each) deli Provolone Cheese, cut in half
1/4 cup sliced mushrooms (optional)
Heat broiler. Melt butter in 10-inch skillet until sizzling; add onions and pepper strips (and optional mushrooms). Cook over medium heat until onion is softened (8 to 10 minutes). Add beef strips; continue cooking until heated through (4 to 6 minutes). Meanwhile, place split rolls onto ungreased baking sheet, cut-side up. Broil 2 to 5 inches from heat until light golden brown (1 to 2 minutes). For each sandwich, place 2 halves cheese on bottom half of bun. Spoon 1/4 hot meat mixture over cheese. Top with 2 halves cheese and top half of bun. Serve immediately.
