Use pure canned pumpkin, not pumpkin pie filling. Slightly stale gluten-free bread works best. Full-fat coconut milk gives the creamiest texture. For a dairy-free version, use coconut oil instead of butter and check that your gluten-free bread is dairy free. Store leftovers covered in the refrigerator for 3 to 4 days. Reheat individual servings in the microwave or warm the full dish at 300°F until heated through.