1 c. shredded Mozzarella cheese
1 c. shredded Cheddar cheese
1/4 to 1/2 can black olives
1 c. chopped mushrooms
1/4 c. chopped onions
1 c. mayonnaise
1 loaf miniature rye bread

Mix above ingredients. Spread on bread. Bake at 350 degrees for 10 minutes.

(Can use either mushrooms or olives - you don't need to use both.)