Add the mashed banana, water, oats, dates, vanilla, and cinnamon to a small pot over medium heat. Bring to a simmer and cook for about 5 minutes, giving a stir every now and then until the oats are tender and most of the water is absorbed.
Divide among 2 bowls and top with the banana slices, and any additonal toppings.
Notes
Soy-Free: To keep this recipe soy-free, choose almond or oat milk rather than soy milk.