Creating Slow Cooker Apple Butter Meatballs is enjoyable and straightforward. Follow these easy steps:

1. Prepare the Meat Mixture: In a large bowl, combine ground beef or turkey, breadcrumbs, egg, chopped onion, milk, garlic powder, salt, and pepper. Mix until well combined.
2. Form Meatballs: Shape the mixture into meatballs, approximately 1 to 1.5 inches in diameter. Place meatballs on a plate or baking sheet.
3. Mix Sauce Ingredients: In a separate bowl, whisk together apple butter, Worcestershire sauce, Dijon mustard, and ground cinnamon (if using) until smooth.
4. Layer in Slow Cooker: Place meatballs in your slow cooker. Pour the apple butter mixture evenly over the meatballs to ensure they are well coated.
5. Cooking: Cover the slow cooker with its lid. Cook on low for 4-6 hours or on high for 2-3 hours, until the meatballs are fully cooked.
6. Check for Doneness: Ensure the internal temperature of the meatballs reaches 160°F (70°C) for beef or 165°F (74°C) for turkey.
7. Serve: Once cooked, gently stir the meatballs to coat them in the sauce before serving.

These steps will guide you in creating the incredible Slow Cooker Apple Butter Meatballs easily.