Preheat the oven to 350°F (175°C). Lightly grease three 4-inch mini springform pans with cooking spray and set them aside.
Whisk the eggs in a medium bowl. Add the mashed banana and vanilla extract, mixing until smooth.
Combine the almond flour, cinnamon, baking powder, and salt. Stir the dry ingredients into the wet mixture until just blended.
Divide the batter evenly into the prepared pans and bake for about 20 minutes, or until the tops are golden and a toothpick comes out clean.
Cool the cakes for about 10–20 minutes before removing them from the pans. Let them cool completely before adding frosting.
Frost and decorate with your favorite topping—Greek yogurt, coconut whipped cream, or a light frosting of your choice. Add fresh berries or sprinkles for color.