This cake is made primarily of almond flour and bananas. It only uses ⅓ cup of sugar, so it is just the right amount of sweet and full of banana flavor.
Preheat oven to 350° F. Grease a 9-in round baking pan, set aside.
In a mixing bowl fitted with the paddle attachment, mix the mashed bananas and brown sugar until well combined. Add the eggs, one at a time, beating after each addition until combined. Add the melted butter, yogurt, and vanilla, mixing until well incorporated.
In a small bowl, whisk together the almond flour, all-purpose flour, baking powder, salt, and cinnamon. Add to the batter, all at once. Mix until everything is well incorporated, being careful not to over mix.
Pour batter into prepared pan. Bake for 30-35 minutes, until a toothpick inserted into the center, comes out clean. Allow cake to cool before removing from pan.
Peanut Butter Frosting
In a mixing bowl fitted with the paddle attachment, mix together the peanut butter, softened butter, salt, honey, and vanilla until light and fluffy, about 2-3 minutes.
Add the powdered sugar and beat for an additional 2-3 minutes until fluffy.
Once the cake has completely cooled. Pour all of the frosting onto the center of the cake. Using a spatula, evenly spread frosting outward to all sides. Swirl frosting with a spatula as you are spreading for a pretty effect.
Store finished cake in the refrigerator, covered, for up to 5 days.