1. Bring milk and 1 1/2 cups water to a boil in a saucepan over medium-high heat, stirring frequently.
2. Coat a 3 1/2-quart electric slow cooker with cooking spray. Place hot milk mixture, apple, and next 5 ingredients (through salt) in slow cooker; stir well. Cover and cook on LOW for 7 hours or until oats are tender.
3. Spoon oatmeal into bowls; top with maple syrup and hazelnuts.
MyRecipes is working with Let's Move!, the Partnership for a Healthier America, and USDA's MyPlate to give anyone looking for healthier options access to a trove of recipes that will help them create healthy, tasty plates. For more information about creating a healthy plate, visit www.choosemyplate.gov.