Cupcakes: Preheat oven to 350°F (175°C) and line cupcake pan. Sift flour, baking powder, baking soda, and salt. In a separate bowl, beat butter and sugar until fluffy. Add vanilla, oil, and eggs one at a time. Alternate adding dry ingredients and buttermilk until just combined. Fill liners ⅔ full and bake 15 minutes or until a toothpick comes out clean. Cool completely.
Frosting: Beat butter, powdered sugar, vanilla, and milk until light and fluffy, adjusting milk for consistency.
Frost: Spread or pipe frosting onto cooled cupcakes. Add sprinkles if desired. Enjoy!
