Creating Peach Bellini Cupcakes is simple when you follow these steps:

1. Preheat the Oven: Preheat your oven to 350°F (175°C). Line a cupcake pan with paper liners.

1. Mix Dry Ingredients: In a medium bowl, whisk together the flour, baking powder, and salt. Set aside.

1. Cream Butter and Sugar: In a large mixing bowl, beat the softened butter and granulated sugar together until light and fluffy.

1. Add Eggs: Add the eggs one at a time, beating well after each addition.

1. Incorporate Flavors: Mix in the peach nectar, champagne, and vanilla extract until well combined.

1. Combine Mixtures: Gradually add the dry ingredient mixture to the wet ingredients, mixing until just combined. Be careful not to overmix.

1. Fold in Peaches: Gently fold in the diced fresh peaches until evenly distributed within the batter.

1. Distribute Batter: Divide the batter evenly among the prepared cupcake liners, filling each about 2/3 full.

1. Bake: Place the pan in the preheated oven and bake for 20-22 minutes or until a toothpick inserted in the center comes out clean.

1. Cool: Remove the cupcakes from the oven and allow them to cool in the pan for 15 minutes. Then, transfer them to a wire rack to cool completely.

1. Prepare Frosting: In a mixing bowl, beat the softened butter until creamy. Gradually add the powdered sugar, peach nectar, and vanilla extract. Mix until smooth and fluffy.

1. Frost Cupcakes: Once the cupcakes are completely cool, frost each with the peach buttercream using a piping bag for decoration.

1. Garnish: Top each cupcake with a small piece of fresh peach for an attractive finish.

These steps provide a clear guideline to bake these incredible Peach Bellini Cupcakes, perfect for impressing your guests.