Step 1

Combine the beef, 3/4 teaspoon salt and 1/4 teaspoon black pepper.

Step 2

Shape into 4 patties, 1/2-inch thick.

Step 3

Grill the patties, 4 to 5 minutesper side or until the internal temperature reaches 160˚F.

Step 4

Meanwhile, heat the olive oil in a large nonstick skillet over medium-highheat.  A

Step 5

Add the onions and cook for 2 minutes.

Step 6

Stir in the mushrooms,barbecue sauce, remaining 1/4 teaspoon salt and 1/8 teaspoon black pepper.

Step 7

Cook and stir for 5 minutes or until tender.

Step 8

Place cheese slices over patties during the last minute of cooking. Serve the burgers in rolls topped with mushroom and onion mixture.