Heat the oven to 400° and spray a baking sheet with cooking spray.
In a bowl, mash the sweet potatoes well, then stir in the brown sugar until combined.
1 cup cooked mashed sweet potatoes, 1/3 cup brown sugar
Add the heavy cream and spices and stir well.
2 tablespoons heavy cream, 1 teaspoon vanilla extract, 1/2 teaspoon salt, 1/2 teaspoon ground cinnamon, 1/4 teaspoon nutmeg, 1/4 teaspoon ground ginger
Unroll the pie crust and use a large (4-inch) cookie cutter. Cut as many circles from each pie crust as possible.
1 (14.1 ounce) packaged pie crusts
Spoon 1 large tablespoon of filling on one side of the dough. Dip your finger in water and go around the edge of the dough.
Fold the dough over and press firmly to seal.
You can make small folds around the pastry to create a pretty border, or use a fork to firmly seal.
Place the pies on the prepared baking sheet. Brush the beaten egg over the pies. Combine the sugar and cinnamon and sprinkle over the egg.
1 egg, 2 tablespoons granulated sugar, 1/4 teaspoon ground cinnamon
Bake for 20 minutes until golden brown.
Remove and serve.