Preheat oven to 350F and spray a 13x9-inch pan with cooking spray.

On a roasting rack or on two cylinders of aluminum foil, place the ham.

Pour on one bottle of Coca-Cola over the ham and top with brown sugar. Cover the pan with aluminum foil and bake 90 minutes, removing the foil and basting the ham every 30 minutes. You can do this either with a baster or a pastry brush.

After 90 minutes remove the foil and let bake until bubbly, crispy, and brown on the top of the ham. Remove if the internal temperature is above 160F.

Let the ham cool for five minutes than transfer the remaining liquid in the pan into a saucepan. Meanwhile in a small bowl whisk together cornstarch and water to make a slurry. Whisk the slurry into the liquid and bring to a boil and cook until thickened. Pour the Coca-Cola ham glaze over the ham and serve.