Brown Sugar–Cinnamon Hand Pies – Garden & Gun

Ingredients

• 2 cups packed dark brown sugar
• ⅓ cup all-purpose flour
• 1½ tablespoons cocoa powder (Dutch process or natural, it doesn't matter)
• 3 tablespoons ground cinnamon
• ½ teaspoon freshly grated nutmeg
• ¼ teaspoon kosher salt
• 4 tablespoons unsalted butter, melted
• 2 recipes All-Butter Pie Dough (recipe follows), formed into square blocks
• Egg wash (1 egg beaten with 1 tablespoon cool water and ¼ teaspoon kosher salt)
• 2 tablespoons cold milk
• ½ teaspoon vanilla extract
• 2 cups powdered sugar
• Sparkling sugar
• 1⅓ cups all-purpose flour
• 8 tablespoons unsalted butter, cubed and frozen for 20 minutes
• Scant pinch kosher salt
• ¼ cup ice water