This apple cinnamon oatmeal cake recipe is perfect for those who love a hearty and healthy cake. The cake is made with oats, whole wheat flour, and apples. It's moist, fluffy, and bursting with apple and cinnamon flavors. To make this cake, you'll need oats, whole wheat flour, sugar, baking powder, salt, cinnamon, eggs, oil, vanilla extract, and apples. Mix the dry ingredients in one bowl and the wet ingredients in another. Then, combine the two mixtures and fold in the chopped apples. Pour the batter into a greased baking pan and bake for 35-40 minutes. Serve warm with a drizzle of honey or maple syrup.