Mix ingredients: Combine all ingredients (except 1 T walnuts and banana slices) in a mixing bowl.
Walnuts: Add chopped walnuts.
Pour: Pour into a greased ramekin. Top with additional walnuts and banana slices.
Bake: Bake at 350°F for 25-30 minutes or until an inserted toothpick comes out clean.
Enjoy: Let cool, top with a drizzle of almond butter and banana slices and dive in! If the baked oats need more moisture you can add a splash of almond milk as well.