To make this casserole gluten-free. Simply swap out the all-purpose flour. For a gluten-free flour blend. Make sure the blend contains a binder like xanthan gum. To help with texture. Since the rest of the ingredients—poblano peppers, cheese, eggs, and seasonings—are naturally gluten-free. This adjustment is quick. And easy. You’ll still enjoy. All the rich flavors of roasted peppers and creamy cheese. In every bite. With the same light. And fluffy texture.