Preheat your oven to 350°F (175°C) and line a 12-cup muffin pan with cupcake liners.
Whisk together the all-purpose flour, baking powder, and salt in a medium bowl.
Cream together the room-temperature unsalted butter and granulated sugar until light and fluffy.
Add each egg one at a time to the butter-sugar mixture, beating well after each addition.
In another bowl, mix together the sparkling grape juice, whole milk, vanilla extract, and peach puree.
Gradually alternate adding the dry and wet ingredients into the creamed butter mixture, mixing until just combined.
Fill each cupcake liner about two-thirds full with batter and bake for 18–20 minutes or until a toothpick comes out clean.