To make this Chicken Spaghetti Bake gluten-free, replace the regular spaghetti with certified gluten-free spaghetti or another gluten-free pasta shape. Confirm that the cream of chicken soup, Velveeta, chicken broth, dry ranch mix, bacon bits, cheddar cheese, and all seasonings are labeled gluten-free, as some packaged products may contain wheat-based thickeners or additives. Use a clean pot, baking dish, utensils, and prep surfaces to prevent cross-contamination. Cook gluten-free pasta just until al dente, as it can soften more during baking.