"Create a dairy-free, wheat-free, corn-free, from-scratch version of Allrecipes 'Thanksgiving Leftovers Casserole' inspired by the original concept. Make it suitable for a household of 3, beginner-friendly, quick and easy (15-30 minutes active time if possible), using minimal processed ingredients and low-inflammation-friendly choices. Exclude all gluten/wheat, dairy, nuts, shellfish, soy, sesame, and corn ingredients. Use imperial units only. Include a clear ingredient list, step-by-step instructions, and note any optional substitutions that remain within the allergy restrictions. Keep the recipe savory and casserole-style, using leftover turkey and vegetables if appropriate, but make it fully from scratch rather than using canned soup or boxed mixes."