01 - Preheat oven to 350°F (175°C) and line a muffin tin with cupcake liners.
02 - Use an electric mixer to cream together unsalted butter and granulated sugar until pale and fluffy.
03 - Beat in the egg, then add vanilla extract, peach purée, and sparkling wine or peach juice, mixing until well combined.
04 - In a separate bowl, whisk together all-purpose flour, baking powder, and salt. Gradually fold into the batter until a smooth mixture forms.
05 - Evenly divide the batter among prepared cupcake liners. Bake for 18 minutes, or until a toothpick inserted into the center comes out clean.
06 - Allow cupcakes to cool completely on a wire rack before garnishing or serving.