Spray the inside of the crock pot with non-stick cooking spray
Add the milk and water to the crock pot. You can adjust the ratio of water/milk; however, I recommend that you keep the total liquid to oats ratio as 3:1.
Add in the oats, maple syrup, vanilla and cinnamon. Stir to combine.
Cook on low for 2-2 1/2 hours or on high for 45 minutes to an hour. You can add more milk to the oatmeal as it cooks if you would like a softer consistency or you find that it's cooking faster.
Get creative with your toppings bar while the oatmeal finishes!