Party Cheese Melts
["1 c. chopped onion", "1 c. chopped mushrooms", "1 c. chopped black olives", "1 c. grated Monterey Jack cheese", "1 c. grated Cheddar cheese", "1 c. mayonnaise"]
["Mix together and spread on individual party rye slices.", "Bake at 350\u00b0 until bubbly."]
["onion", "mushrooms", "black olives", "grated Monterey", "Cheddar cheese", "mayonnaise"]