Mix together in a medium mixing bowl.
1 1/2 cups mayonnaise 
1 cup shredded sharp cheese
1/2 cup thinly sliced onion or one bunch of green onions chopped
3 minced garlic cloves chopped or 1 T. minced garlic in the jar
1 loaf French bread
Cut French bread length ways, lay open. Spread mixture on each half of bread about 1/4 to 1/2 thick.
Sprinkle with parmesan cheese. Wrap each half tightly in foil. Refrigerate for 1 to 2 hours. Bake at 400° for 10 minutes or until heated through. Remove bread from oven, place on a cutting board, remove from foil, slice bread into 2 inch pieces. Serve hot.
Freeze the foil wrapped bread up to 3 months and use at a later date. Bake at 400° for 20 to 25 minutes or until warm through