1 c. Mozzarella cheese, shredded
1 c. cheddar cheese, shredded
1 c. green onions, chopped
1 c. fresh mushrooms, chopped
1 sm. can ripe olives
1 c. mayonnaise (not salad dressing)
1 loaf party rye bread

Mix ingredients and spread on rye rounds. (Make ahead and keep in refrigerator.) Heat in oven, 300 degrees, for 10 to 15 minutes.