"Create a from-scratch, dairy-free, wheat-free, corn-free version of Allrecipes 'Easy Meatball Casserole' for a household of 3. Keep it beginner-friendly, quick/easy (15-30 min active time if possible), minimal processing, and use imperial units only. Avoid gluten, dairy, nuts, shellfish, soy, sesame, and corn. Include homemade meatballs and a homemade sauce/casserole base instead of any packaged ingredients. Make it suitable for an omnivore family, low inflammation, and rotation-diet friendly. Provide clear ingredients and simple steps."