Three Cheese Garlic Bread

Name: Three Cheese Garlic Bread
Ingredients: 2 tablespoons mayonnaise; 2 tablespoons butter, unsalted, room temperature; 4 cloves garlic, minced; 3/4 cup green onions, thinly sliced; 3/4 cup feta cheese, crumbled; 3/4 cup monterey jack cheese, shredded; 1/2 cup Parmesan, grated, divided; 1 loaf focaccia bread, 10-12 ounces