To make this Guy Fieri’s Mac Salad Recipe gluten free, replace the macaroni with certified gluten-free short pasta, such as gluten-free elbows or small tubes. Verify that the mayonnaise, yellow mustard, white vinegar, roasted red bell peppers, peppadew peppers, pepperoncini, and seasonings are gluten free. Cook gluten-free pasta carefully, as it can soften quickly, and rinse or cool it promptly to help maintain texture. Use clean utensils, bowls, cutting boards, and serving dishes to avoid cross-contact with gluten-containing foods.