Preheat oven to 350 degrees F. Grease two 8-in round cake pans.
In the bowl of a stand mixer, beat together the butter and sugar until light and fluffy. Beat in the eggs, one at a time, until combined. Add the vanilla extract and mashed bananas and beat until combined.
In a bowl, combine the dry ingredients. Working in three batches, alternate between adding the dry ingredients and the buttermilk/kefir to the butter and sugar mix. Using a silicone spatula, fold in the sweetened shredded coconut. Pour the batter evenly between the two cake pans and bake for 25-30 minutes, until a toothpick inserted into the center of the cakes comes out clean. Let the cakes cool for 5-10 minutes in the pan, then transfer to a cooling rack. Let cool completely.
To make the chocolate frosting, combine cocoa powder and powdered sugar in a bowl and set aside. Beat butter and sugar mixture together until creamy. Beat in vanilla extract and milk until combined.
Pour the frosting onto the cake and use an offset spatula to frost the cake. Top with Chocolate Decorating Sprinkles (optional).
Did You Make This Recipe?
Tag @sweetandsorrel on Instagram and hashtag it #sweetandsorrel so we can see all the deliciousness!