Caramel Apple Hand Pies

Name: Caramel Apple Hand Pies
Ingredients: 1 3/4 cups 1/2-in. pieces Granny Smith apple (from 1 large apple); 1/4 cup (53 g) packed light brown sugar; 1 tsp. fresh lemon juice; 1/8 tsp. kosher salt; 1 tsp. ground cinnamon, divided; 1/4 tsp. ground nutmeg, divided; 4 Tbsp. (1/2 stick) unsalted butter, melted, divided; 1 1/4 tsp. cornstarch; 2 14.1-oz. pkg. refrigerated piecrusts (4 crusts total), softened according to pkg. directions; 1 large egg, beaten; 8 soft caramels (such as Werther’s Original), cut into eighths; 1/2 cup (99 g) granulated sugar