1 lg. onion, sliced
2 tbsp. butter
1 lb. thin roast beef slices
1 (8 oz.) jar Cheez Whiz cheese spread
6 (6 inch) French bread rolls, partially split

Microwave onions and butter in a 1 quart bowl on high for 1 minute; add meat. Microwave cheese spread as directed on the label. Fill rolls with meat and onions; place on paper towels. Microwave 30 seconds. Top with cheese spread.