1/2 c. butter
2 med. onions, thinly sliced
4 c. hot water
1 pkg. (1 3/8 oz.) onion soup mix
2 tsp. instant beef bouillon
1 tsp. Worcestershire sauce
4 1/2 inch slices, toasted French bread
1/4 c. grated Parmesan cheese

Combine butter and onion in 2 quart casserole. Microwave at high until onions are tender-crisp, 4 to 6 minutes. Add water, onion soup mix, instant bouillon, and Worcestershire sauce; cover. Microwave at high 5 minutes. Reduce power to medium (50%); microwave until onions are tender and flavors are blended (15 to 20 minutes). Ladle into 4 serving bowls. Place toast on top. Sprinkle each with 1 tablespoon Parmesan cheese. Microwave at high until cheese softens, 5 to 7 minutes.