| 4 | slices | Bacon |
| 1/4 | C | Chopped onion |
| 1 | 4 oz. can | Mushroom pieces drained & finely chopped |
| 1 | lb | Lean ground beef |
| 1 | lb | Bulk pork sausage |
| 1/4 | C | Grated Parmesan cheese |
| 1/2 | tsp | Pepper |
| 1/4 | tsp | Garlic powder |
| 2 | tbsp | Steak sauce |
| 8 | Hamburger buns, split & toasted | |
| Leaf lettuce, optional |