Spray the insert of the slow cooker with cooking spray. Unwrap the ham and place it flat side down into the slow cooker.
In a saucepan, over medium-high heat, combine the brown sugar, honey, Dijon mustard, and water. Heat and stir until the sugar is dissolved. About 1-2 minutes. Pour the glaze over the ham.
Cover with the lid and cook on LOW heat for 5-6 hours. * 3-4 times during the cook time, take a baster or a large spoon, and pour some of the glaze over top of the ham.
Take the ham out and place onto a serving plate. At the end of the cook time the slices of ham should be noticeable so take a knife and finish cutting the slices. Use the glaze from the slow cooker and pour some over the ham slices. Serve!
Pour the liquid from the slow cooker into a sauce pan. Set the heat to medium-high. Mix together the cornstarch + water and pour into the saucepan. Cook for 1-2 minutes or until it boils. Reduce heat and let simmer until desired thickness is reached.
