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1. Prepare grill.

2. Heat a medium nonstick skillet coated with cooking spray over medium heat. Add onion; cover and cook 5 minutes, stirring occasionally. Add sugar, 1⁄4 teaspoon salt, and 1⁄4 teaspoon pepper; cook, uncovered, 5 minutes or until tender, stirring frequently. Remove onion from pan, and keep warm.

3. Heat pan coated with cooking spray over medium-high heat. Add mushrooms and 1⁄4 teaspoon salt; sauté 5 minutes or until tender.

4. Combine 1⁄4 teaspoon salt, 1⁄4 teaspoon pepper, Worcestershire sauce, and beef. Divide mixture into 4 equal portions, shaping each
into a 1⁄2-inch-thick patty.

5. Preheat broiler.

6. Place patties on a grill rack coated with cooking spray; grill 5 minutes on each side or until done. Place bread on grill rack; grill 1 minute on each side or until toasted.

7. Arrange bread on a baking sheet. Top each bread slice with 1 patty, 1⁄4 cup onion, 1⁄4 cup mushrooms, and 2 tablespoons cheese; broil 2 minutes or until cheese melts. Yield: 4 servings.