Preheat oven to 425°F.
Combine the flour, baking powder, salt, sugar, and shortening in a large bowl. Use a pastry cutter to cut the shortening into the flour until it resembles coarse crumbs. This step can also be done in a food processor. Add the milk and stir with a fork just until the dough clumps together. Cover with plastic wrap and set aside in the fridge.
2 cups all-purpose flour, 3 teaspoons baking powder, 1/2 teaspoon salt, 1 Tablespoon granulated sugar, 6 Tablespoons shortening, 1/2 cup milk
Peel and core the apples using a paring knife or apple peeler.
6 medium-sized apples
Roll out the pastry dough on a lightly floured surface. Cut into large squares and place an apple in the center of each square. Divide the butter, sugar, and cinnamon evenly between each of the apples.
1/2 cup granulated sugar, 1 1/2 teaspoons cinnamon, 3 Tablespoons salted butter
Wrap the pastry up around each apple, pinching the edges together to seal. Transfer to a 9x13-inch baking dish.
Make the syrup by combining the water, sugar, butter, and cinnamon in a small saucepan. Bring to a boil and cook until the butter is melted and the sugar is completely dissolved. Pour the hot syrup over the apple dumplings in the baking dish.
1 cup granulated sugar, 2 cups water, 3 Tablespoons salted butter, 1/4 teaspoon cinnamon
Bake for 35-40 minutes until golden brown and the apples pierce easily with a sharp knife. Cool for at least 15 minutes before serving.