If your ham is not spiral-cut, use a sharp knife to score the surface of the ham in a diamond pattern, about 1/4 inch deep. This helps the glaze penetrate and creates a beautiful presentation.

In a medium bowl, whisk together the cola, packed brown sugar, Dijon mustard, Worcestershire sauce, garlic powder, and ground cloves until the sugar is dissolved and the mixture is well combined.

Place the ham in your 6-quart or larger slow cooker. If using a whole ham, place it cut-side down. Pour the prepared cola glaze evenly over the ham, ensuring it coats all sides and collects at the bottom of the pot.

If desired, arrange pineapple rings over the ham, securing them with toothpicks if needed, and place maraschino cherries in the center of the pineapple rings.

Cover the slow cooker and cook on low for 8-10 hours or on high for 4-6 hours. The cooking time will vary depending on the size and shape of your ham and your specific slow cooker. The ham is fully cooked, so you are essentially heating it through and allowing it to absorb the glaze.

During the last hour of cooking, you can baste the ham with the glaze from the bottom of the slow cooker every 30 minutes for extra flavor and shine.

Once heated through and glazed, carefully remove the ham from the slow cooker and transfer it to a large cutting board. Tent loosely with foil and let it rest for 10-15 minutes before carving. This allows the juices to redistribute.

Serve the carved ham with the accumulated glaze from the slow cooker spooned over the top. Enjoy!