To make this Brownie Batter Dip Recipe gluten free, use a certified gluten-free brownie mix and verify that the whipped topping, cream cheese, milk, and mini chocolate chips are gluten free. Serve with gluten-free dippers such as gluten-free pretzels, gluten-free graham crackers, fresh fruit, marshmallows, or gluten-free cookies. Use clean bowls, utensils, and prep surfaces to prevent cross-contact with gluten-containing ingredients.