• Turn the oven on to 350 degrees.
• Combine flour, baking soda, and salt in a mixing bowl.
• Combine butter and sugar in the bowl of an electric stand mixer fitted with the paddle attachment granulated sugar until pale and fluffy.
• Mix in the egg, then add the egg yolk and vanilla. Mix in the mashed bananas.
• Mix just until combined with 1/3 of the flour mixture, and 1/2 of the buttermilk, and repeat the process once more with flour and buttermilk.
• Lastly, add the remaining 1/3 of the flour mixture and the chocolate chips and mix until combined. After scraping the bowl’s sides and bottom, fold the batter.
• Divide batter among 12 paper-lined muffin cups, filling each with about 3/4 full.
• Bake in preheated oven until a toothpick inserted into the centre of a cupcake comes out clean, about 20 – 25 minutes.

FROSTING

• In the bowl of an electric stand mixer cream together cream cheese and butter until smooth.
• Mix in powdered sugar and blend until light and fluffy.

ASSEMBLE

• Cool in pan for several minutes then transfer to a wire rack and cool completely. frost with cream cheese frosting, top with 2 banana slices and sprinkle with chocolate chips.
• Store in the refrigerator in an airtight container and allow to rest at room temperature for about 5 – 10 minutes before serving.