1 c. chopped onion
1 c. shredded Cheddar cheese
1 c. shredded Swiss cheese
1 c. mayonnaise

Place all ingredients in a greased small oven proof dish. Sprinkle with paprika or chili powder. Bake at 400 degrees for 15 to 20 minutes until bubbly. Serve with small slices of French bread or crackers.