Preheat oven to 350° Fahrenheit. Grease or line cake pans with parchment paper.
Add oats to a food processor or blender and blend into a flour. You can also use oat flour if you have it. Combine with the rest of dry ingredients.
In a separate bowl, combine all the wet ingredients together.
Combine dry and wet ingredients and mix until everything's well incorporated.
Evenly distribute the batter into three 5 inch cake pans. Bake for 25-30 minutes, until inserted toothpick comes out clean.
Let the cakes cool slightly in the pan for about 5 minutes before transferring to a wire rack to cool completely.
In the meantime prepare the frosting of choice(see note).
Slice the rounded top off of each cake to create a flat surface. Add dollops of frosting to first layer of cake and spread evenly. Place the second layer on top and repeat. You can go a step further and frost the entire cake.
