Roughly chop both black olives and pimento stuffed green olives. Slice green onions into thin pieces.
Combine butter, mayonnaise, cheese, olives, and green onions into a mixing bowl. Stir together until thoroughly combined. Spread mixture onto French bread that has been halved lengthwise. Bake at 350 degrees for 20-25 minutes or until cheese is melted and browning.
Note: This recipe can be frozen. Simply spread mixture onto bread and wrap in aluminum foil. Freeze until ready. Increase cook time by 5-10 minutes