Gather ingredients: Start by collecting all the necessary items: your bone-in ham, brown sugar, honey, Dijon mustard, cinnamon, and apple cider vinegar for a delightful glaze.

Mix the glaze: In a mixing bowl, combine the light brown sugar, honey, Dijon mustard, ground cinnamon, and apple cider vinegar. Stir until the mixture is smooth and well-blended, creating a luscious glaze for your ham.

Score the ham: Using a sharp knife, score the surface of the ham in a diamond pattern. This technique helps the glaze seep into the meat, enhancing flavor and moisture.

Apply the glaze: Generously rub the prepared glaze all over the scored ham, ensuring that it gets into every cut and nook.

Cook in the slow cooker: Place the beautifully glazed ham in your slow cooker. Cover it securely and set the heat to low. Let it cook for 6 to 8 hours, or until the ham is tender and heated through.

Slice and serve: Once cooked, take the ham out and let it rest briefly before slicing. Drizzle the remaining glaze over the slices for that extra burst of flavor.