Slowly add your flour mixture in thirds alternating with the milk, mixing to incorporate with each addition. Beat until just combined, don't overmix. Divide your batter evenly into your prepared cupcake pan, filling about 2/3 full.
Bake for 20-23 minutes or until a toothpick inserted in the middle comes out almost clean. Cool in the pan for 5 minutes, then transfer to a wire rack and cool to room temperature before frosting.