01 -
Heat your oven to 325°F and line a muffin pan with paper liners. In a large mixing bowl, whisk together the cake mix, eggs, oil, milk, sour cream, and vanilla. Beat everything together for about 2 minutes until well combined, making sure to scrape down the bowl sides with a spatula.
02 -
Divide the batter evenly among the cupcake liners, filling each about three-quarters full. Bake for 18 minutes, or until a toothpick inserted in the center comes out clean. Let them cool completely on a wire rack.
03 -
While the cupcakes cool, cream the softened butter with vanilla using an electric mixer for about 5 minutes until light and fluffy. Gradually add the powdered sugar, then add milk as needed to reach your desired consistency.
04 -
Transfer the frosting to a piping bag fitted with a round tip. Pipe a generous swirl of frosting on each cooled cupcake. Place a strawberry upside down on top of each frosted cupcake, then add a small dollop of frosting to the pointed tip of each strawberry to create Santa's hat pompom.