1. To make oatmeal: Preheat oven to 350°F and grease 8×8 baking dish. In large bowl, mix banana, egg, nut butter, maple syrup, honey, milk, and vanilla extract. Add oats and baking power, and mix until well combined. Add to baking dish, and bake 20–25 minutes.
2. To make glaze: While oatmeal bakes, strain cashews and place in blender or food processor. Add remaining glaze ingredients, and blend until creamy.
3. Remove oatmeal bake from oven, top with glaze, and enjoy!