Turning this Chile Relleno Casserole into a gluten-free delight is surprisingly simple. Swap out the all-purpose flour for your favorite gluten-free blend to keep the batter’s texture perfect. Ensure your canned ingredients—green chile peppers, evaporated milk, and tomato sauce—are labeled gluten-free to avoid any cross-contamination. With these quick tweaks, you’ve got a casserole that’s just as cheesy and comforting, ready to be enjoyed by everyone at the table.