Whisk the brown sugar, mustard, cornstarch, and chipotle, if using, in a small bowl.
Gently rub the brown sugar mixture over the ham and down in between the slices.
Pour the Coke over the ham.
Cover the ham loosely with foil and bake for 1 hour.
Take the ham out of the oven and remove the foil.
Baste the ham with the pan juices. You can use a spoon, a baster, or a brush.
Leave uncovered and place back in the oven.
Cook for 30 more minutes.
Baste with the glaze and return to the oven for another 30 minutes.
Baste with the glaze and bake for 10 minutes.
Remove from the oven and let stand for 5 minutes before serving.
Notes
StorageI recommend tightly wrapping leftover ham with plastic wrap then aluminum foil. This method will allow you to keep the ham in the fridge for five to seven days.You can also put it in an airtight container and freeze for 3 or 4 months.Tips
Spiral sliced ham works best for this recipe.
Be sure you don't bring home an uncooked ham by accident.
Baste the ham all over using a turkey baster. If you don't have one, a ladle will do the trick, too. A brush is a good last resort.
Be careful when basting. It's easy to get distracted and accidentally grab the pan—keep your potholders close because it stays hot!
The brown sugar cola glaze gets really sticky, so I like to line the roasting pan with heavy-duty foil. It makes cleanup much easier.