Mash banana in a small bowl with lemon juice. In the bowl of an electric mixer fitted with the paddle attachment, cream butter until light and fluffy (about 1–2 minutes). Add mashed banana and beat for another 1–2 minutes until well mixed. Add powdered sugar 1 cup at a time. Add in brown sugar, cinnamon, rum (optional), and vanilla extract. Beat for 2 minutes. Add
more powdered sugar to thicken frosting or milk to loosen frosting.
Notes
Tip: Bananas Foster is my favorite dessert so I had to turn this classic favorite into a frosting! It pairs well with all types of cakes, whoopee pies, even cookies! You can omit the rum or use rum extract. Want more banana flavor? Add in a teaspoon of banana extract.