Spinach Artichoke Stuffed French Bread

Name: Spinach Artichoke Stuffed French Bread
Ingredients: 1 loaf French bread (a wider, soft loaf works better for this); 1 (10 oz.) pack frozen spinach, thawed; 2 cloves garlic; 1 can (14 oz.) artichoke hearts, drained; 4 oz. cream cheese, softened to room temperature; 1/2 cup mayo; 1/2 cup sour cream; 1/2 cup freshly shredded parmesan cheese; 1/2 cup freshly shredded white cheddar cheese; 1 cup freshly shredded mozzarella cheese, divided; 1 tsp. each salt and pepper; 4 slices bacon, cooked and crumbled (optional)