Apple Walnut Crostata | Metropolitan Market

Ingredients

• 2 large baking apples (1 pound) (peeled, cored, and thinly sliced)
• 1/2 cup packed light brown sugar
• 1/4 cup all-purpose flour
• 1/4 teaspoon kosher salt
• 1/4 teaspoon vanilla extract
• 1 homemade or store-bought pie crust pastry (for single crust pie)
• 1/3 cup walnuts (roughly chopped)
• 2 tablespoons unsalted butter (diced)
• 1 egg beaten with a splash of water
• Powdered sugar