Buffalo Chicken French Bread

Name: Buffalo Chicken French Bread
Ingredients: 1 (8 ounce) package cream cheese, room temperature; 1/4 cup sour cream; 1/4 cup mayonnaise; hot sauce to taste (I use 1/4 cup Franks Red Hot); 2 teaspoons ranch seasoning* (optional); 1 teaspoon smoked paprika; salt and pepper to taste; 2 cups chicken, cooked and diced or shredded; 1/4 cup blue cheese, crumbled (optional); 1 cup mozzarella cheese, shredded; 1 cup cheddar cheese, shredded; 1 large French loaf, top cut off and hollowed out (gluten-free for gluten-free); 2 cups cheddar cheese, shredded