● Preheat oven to 350°F. Grease and flour two 9" round cake pans, set aside.
Mash bananas well and place them in a small bowl; set aside.
● In a large bowl add the cake flour, baking powder, baking soda, cinnamon, nutmeg, and salt; whisk well to combine then set aside.
In a large bowl using a handheld electric mixer, or using a stand mixer fitted with the paddle attachment, beat butter, vanilla, and sugar until light and fluffy; about 4 minutes (don't skimp on time here!). Add in the eggs, one at a time, beating well after each addition, and scraping down the sides of the bowl as needed.
● On low speed, beat in the flour mixture alternately with the milk. Fold in banana puree.
Divide batter evenly among the prepared pans and bake in preheated oven for 30 to 35 minutes, or until a cake tester inserted in center comes out clean.
● Allow the cakes to cool in the pans for 10 minutes before gently running a knife around the edges to loosen any stuck bits, then turning them out onto a cooling rack to cool completely.
● While the cakes cool, you can make the frosting.