Prep Time 20 minutes mins
Cook Time 18 minutes mins
Resting Time 30 minutes mins
Total Time 1 hour hr 8 minutes mins
For best results, avoid overmixing the batter once the flour is added to keep the cupcakes tender, and use room-temperature ingredients so the batter emulsifies smoothly. Gel food coloring is preferable because it gives bright color without thinning the batter or frosting. If you live in a warm climate, chill the frosted cupcakes for 15–20 minutes before transporting so the swirl holds its shape. Store cupcakes covered at room temperature for up to 2 days or refrigerate for up to 4 days, bringing them back to room temperature before eating. You can also bake the cupcakes a day ahead, keep them unfrosted and covered, and frost just before serving for the freshest texture and prettiest finish.