1/2 cup sugar
6 Tbsp unsalted butter, softened, divided
1 large egg(s)
2 tsp vanilla extract, divided
2 cup all-purpose flour
2 tsp baking powder
1 tsp baking soda
1/4 cup fat-free skim milk
4 large banana(s), ripe, mashed
1 cup powdered sugar
1 Tbsp fresh lemon juice
1 tsp lemon zest, strips, or more to taste
Preheat oven to 350ºF. Line 18 muffin holes with paper liners.
Place sugar and 5 tablespoons of butter in a large bowl; cream with an electric mixer until light and fluffy. Add egg and 1 teaspoon of vanilla; beat until thoroughly mixed.
In another large bowl, mix together flour, baking powder and baking soda. Add half of flour mixture to butter mixture; beat well with mixer. Add milk and remaining flour mixture; beat until batter is combined and then fold in mashed bananas.
Spoon batter into muffin liners about 3/4 full. Bake until muffins start to brown and a tester inserted in center of a muffin comes out clean, about 25 to 30 minutes. Allow muffins to cool in pan for about 2 minutes; remove to a wire rack and cool completely before icing.
Meanwhile, to make icing, combine powdered sugar, remaining tablespoon of butter, lemon juice, zest, and remaining teaspoon of vanilla in a medium bowl; beat with an electric mixer until creamy, about 1 to 2 minutes. Ice cooled muffins; cover and refrigerate any uneaten muffins. Yields 1 muffin per serving.
If the mouth-puckering lemon icing isn't enough flavor for you, try adding 1/2 teaspoon each of cinnamon, nutmeg and ginger to the flour mixture.
READ MY TIPS FOR NO FAIL MUFFINS HERE