To make this Cream Cheese Stuffed Celery gluten free, verify that the ranch dry dressing mix, mayonnaise, cream cheese, shredded mozzarella cheese, smoked paprika, and all packaged ingredients are labeled gluten free. Use fresh celery that has been washed and dried thoroughly. Prepare the recipe with clean utensils, bowls, cutting boards, and serving trays to prevent cross-contact with gluten-containing ingredients.