
1 pie crust (recipe in link below)

1 egg, beaten, for brushing

vanilla sugar or coarse sugar, for sprinkling

4 large eggs

1 1/2 cups granulated sugar

1/2 cup unsweetened cocoa powder

2 teaspoons instant coffee granules

1/2 teaspoon kosher salt

10 tablespoons salted butter, melted

1 tablespoon hazelnut liquor (optional)

2 teaspoons vanilla extract

1/2 cup semi-sweet chocolate chips or chunks