1 In A Large Bowl, Mix Together The Cheeses And The Green Onion. Stir In The Mayonnaise And Sour Cream. In A Separate Small Bowl Blend The Butter And Garlic Until Smooth. Add The Butter Mixture To The Cheese Mixture. 2 Preheat Broiler. Slice Loaf Of Bread In Half Horizontally, Lay Crust Side Down. Spread Cheese Mixture Over The Bread. Place Under The Broiler Until Nicely Browned, About 3 To 5 Minutes. 3 Remove From Broiler And Let Sit For 5 Minutes Until Cool Enough To Handle. Slice The Bread With A Bread Knife. Serve.