Preheat oven to 350°F. Line two muffin tins with 18 cupcake liners.
Toss chopped strawberries with 1/4 cup flour in small bowl.
Mash banana in small bowl.
Whisk oil, egg, brown sugar, sugar, sour cream, and vanilla extract together in large bowl.
In a separate bowl, stir together 1 1/4 cups flour, baking powder, baking soda, and salt.
Add flour mixture to oil mixture. Stir until combined or mix on low speed. Add banana. Add strawberries. Add food coloring if desired.
Bake for 12-15 minutes or until cupcakes bounce back when gently touched. Let cool completely on cooling rack before frosting.
For the Vanilla Buttercream Frosting
Add butter to mixer fitted with paddle attachment. Add 2 cups powdered sugar. Cover bowl.
Turn mixer on medium and mix until consistency resembles pebbles. Add vanilla extract and 2 Tbsp. milk. Turn speed to high.
Reduce speed and add 1/2 cup powdered sugar. Alternate between powdered sugar and milk until desired consistency is achieved. Turn mixer on high for 60 seconds. Frost cupcakes and top with whole strawberry.
Notes
This is a great recipe to make with kids. Let them have fun mashing the banana or dust the strawberries in flour!Adapted from Averie Cooks' Strawberry Banana Bread