To make this recipe gluten free, replace the all-purpose flour with a gluten-free all-purpose flour blend that is suitable for coating and air frying. Make sure the blend is a one-to-one substitute for regular flour for the best texture. Also check that the garlic powder, black pepper, sea salt, and olive oil spray are labeled gluten free, especially if you are preparing this recipe for someone with celiac disease or a strong gluten sensitivity. If serving with ranch dressing, confirm that the dressing is also gluten free. To avoid cross-contact, use clean utensils, bowls, and air fryer components before preparing the peppers.