Elvis Cupcakes - peanut butter frosting and banana nut muffin

So I thought I was done with my birthday baking. My 6yr olds birthday falls on a school day so he insisted that I had to bring a cake to his class even though we just had a birthday party. 
Our tradition is to have a special b-day breakfast.  All he wanted was a fruit bowl and I made banana nut muffins so that I can transform them into Elvis cupcakes for his class later that day.

Deliciousness.  I of course took the easy route and made banana muffins from a box and added ripe bananas to them and then I made some homemade peanutbutter frosting that was A-mazing!