8 kaiser rolls, split
4 slices provolone cheese, halved
1/2 tsp. seasoned salt
2 tbsp. steak sauce
2 pounds lean ground beef (90% lean)
1/4 cup chopped green pepper
1/4 cup chopped sweet red pepper
1/4 cup chopped onion
2 cups chopped fresh mushrooms
2 bacon strips, finely chopped