To make this Easy Christmas Breakfast Sausage Casserole gluten-free. You can easily swap out a few ingredients. Use your favorite gluten-free bread. In place of the white bread. Many grocery stores. Offer delicious gluten-free options. That will work perfectly in this recipe. Make sure the mustard powder. And all other seasonings. Are certified gluten-free as well. If you're adding any additional ingredients like veggies. Ensure they're not processed in a facility. That handles gluten. To avoid cross-contamination. With these simple adjustments. You can enjoy all the delicious flavors of this comforting casserole. Without any gluten worries.