This oatmeal cake is just 2 ingredients and produces a soft and moist cake that you can enjoy for breakfast, snack or dessert. The cake doesn't need any flour, eggs, added sugar, butter or oil.
Preheat oven to 350°F. Line the bottom and sides of a 6 inch round cake pan with parchment paper.
In a large mixing bowl, add pureed bananas. If adding baking powder, sprinkle 1/2 tbsp of baking powder on top. Whisk until baking powder is fully dissolved and mixed in. Add in oats. Stir until oats are evenly mixed in.
Pour batter into cake pan. Bake for about 30 minutes or until done. When done, the surface of the cake should look dry. The top of the cake should feel firm. See notes for more details. Let cake cool before slicing. Uneaten cake can be stored at room temperature for 1-2 days and longer in the fridge.
Notes
I divided the cake into small slices because each slice is packed with oats and bananas.
The bananas need to be pureed to a smoothie consistency. Just mashing them is not enough. This recipe also works best with just ripened bananas rather than overripe bananas. See post for more details.
This cake is baked in a 6 inch round cake pan or a springform pan. If you don't own a 6 inch pan, you can use something bigger, but know that your cake will come out flatter and baking time will likely need to be reduced.
When the cake is finished cooking, the top of the cake should appear dry. For the no baking powder version, when you press on it, it should feel firm rather than sink in. If you are making the baking powder version, it will sink in a little but not completely. If you slice into your cake and you find that it is too moist, you can still put it back into the oven and bake for another 5-10 minutes or as long as needed.
See post for more details on the difference between the baking powder version and no baking powder version.
See post for some mix-in ideas to enhance or add flavors to the cake.
Nutrition estimate is for version without baking powder.
The nutrition information provided are only estimates based on an online nutritional calculator. This is not a comprehensive list of all the nutrients in the recipe (i.e., does not include vitamins, cholesterol, etc). I am not a certified nutritionist. Please consult a nutritionist or doctor for accurate information and any dietary restrictions and concerns you may have.