Preheat the oven to 350F. Line a muffin tin with 6 paper liners and set aside.
2. Sift the flour, baking powder, baking soda, and salt together into a bowl. In a stand mixer fitted with a paddle attachment, mix the mashed banana, sugar, egg, and melted butter together until well combined on medium speed.
3. Add the flour to the mixer in two additions. Give the batter a good stir with spatula to make sure it's well incorporated.
4. Scoop the batter evenly into the prepared muffin tin. Bake for 15-20 minutes until it's golden brown and a skewer comes out clean when inserted in the center. Let it cool completely before frosting.
5. Split the twinkles in half lengthwise. Scoop out the cream and layer it onto the muffins. Top with sprinkles and a blue candle.