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 the top of the bread and hollow out the 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.
Top with hot sauce, blue cheese crumbles, bacon, and chives.