Crock-Pot Garlicky Mashed Potatoes

Grease the inside of your slow cooker with cooking spray. Add potatoes, butter, garlic, and water to slow cooker. Season with salt and pepper. Stir, cover, and cook on high heat for 3 hours, or until potatoes are tender. Once potatoes are tender, add sour cream, milk and spices. Mash with a potato masher and season with more salt and pepper, to taste.  Garnish with chives before serving.