Start by placing your chicken breasts in a slow cooker, spread out evenly. Next, mix together the honey, French's Honey Mustard, Garlic, and Olive Oil together in a medium bowl. Pour the sauce over the chicken breasts and cook on low for 4-6 hours. About 30 minutes before you're ready to eat, mix the milk and cornstarch together in a small bowl and add it to the slow cooker. Whisk it together with the sauce to allow it to thicken slightly. Serve with mashed potatoes and a side salad!