This Easy Peaches and Cream Dessert Is Summer in a Slice

Name: This Easy Peaches and Cream Dessert Is Summer in a Slice
Ingredients: 2 medium fresh firm-ripe peaches (6 ounces; 175 g each), peeled and chopped (about 2 cups), plus 1 peach thinly sliced for garnish; 1 tablespoon (15 ml) fresh lemon juice from 1 lemon; 7 tablespoons granulated sugar (3 1/4 ounces; 92 g), divided; 2/3 cup (3 ounces; 85 g) all-purpose flour; 1/4 teaspoon Diamond Crystal kosher salt; for table salt, use half as much by volume; 3/4 cup (180 ml) whole milk; 1 large egg; 4 tablespoons unsalted butter (2 ounces; 57 g), softened, divided; 4 ounces (113 g) cream cheese, softened; 1/2 cup (120 ml) heavy whipping cream; Powdered sugar for serving; Homemade or store-bought whipped cream for serving