Preheat oven to 350 degrees F.
Slice about 2 inches deep through the top of the bread, and continue to cut a large rectangle, being careful not to cut through the bottom of the bread. Remove top of bread and hollow out middle to create a rectangular bread bowl. Set aside.
Whisk together cream cheese, sour cream, mayonnaise and hot sauce and all spices/seasonings until well combined.
Stir in blue cheese, 3/4 cup cheddar and 3/4 cup mozzarella followed by chicken.
Spoon Buffalo Chicken Dip into prepared French bread and top with remaining cheddar and mozzarella cheeses. Bake on a baking tray at 350 degrees F for 25-30 minutes or until cheese is melted and slightly golden.
Let bread sit approximately 10 minutes to set and slightly cool then slice. Best served warm.