A delicious muffin that the kids will love.
Preheat oven to 375 degrees.
Prepare your muffin tins by either lining with cups or spraying with non-stick spray.
In a large bowl or mixer combine the mashed bananas, sugar, cornstarch, water, melted butter, salt, and vanilla. Mix until well combined.
In a separate bowl, combine flour and baking powder.
Slowly add the flour mixture to the banana mixture, until all is incorporated.
Pour batter into muffin tins about ¾ of the way full.
Bake for 25-30 minutes.
Let cool for 5 minutes before transferring to a cooling rack.
Prepare frosting by beating butter with an electric mixer at medium-high speed until creamy.
Gradually beat in sugar until smooth. Beat in vanilla and 2 Tbsp. milk, adding additional milk, if necessary, for desired consistency.
When muffins are cool, spread on frosting and sprinkle with walnuts.