Add all your ingredients (oats, almond milk, water, vanilla extract, and cinnamon powder) into a slow cooker and give it a good mix.
Cook oatmeal on low for 6-8 hours or on high for 3-4 hours. If you like a chewier, al-dente style steel cut oats, reduce time for either low/high by an hour. Top with granola, fresh fruits, agave, and extra cinnamon powder. Enjoy!