Preheat the oven to 375℉. Line a rimmed baking sheet (12"x17") with parchment paper, silpat liner, or spray with nonstick cooking spray. Set aside.
Spiced Sugar Topping : Stir together the sugar, cinnamon, and pumpkin pie spice in a small bowl with a fork. Set aside.
1/2 cup granulated sugar, ½ teaspoon ground cinnamon, ½ teaspoon pumpkin pie spice
Apple Cider Cookies : In a medium mixing bowl using an electric hand mixer, or use a stand mixer with the whisk attachment, combine the sugar cookie mix, 1 teaspoon of the apple cider mix, and pumpkin pie spice.
1 bag (17.5 oz) sugar cookie mix, 1 packet (.74 oz) apple cider mix, ½ teaspoon pumpkin pie spice
Add in the egg, softened butter, and sour cream. Beat until combined and creamy, and the dough is soft.
1 large egg, 3/4 cup full-fat sour cream, 1/2 cup (1 stick) salted butter
Scoop the dough out onto the prepared cookie sheet, using a medium cookie scoop (about 1.5 tablespoons of dough). Use a spoon to generously sprinkle some of the cinnamon & sugar topping over the top of each cookie scoop. Cook for 9-12 minutes or until the edges are set and the tops are golden brown. Remove the cookies from the oven and allow them to cool for 10 minutes on the cookie sheet before removing them to a cooling rack. While the cookies are cooling, pour the hot water and the remaining apple cider mix into a small bowl and stir together with a fork until dissolved.
3/4 cup hot water, remaining apple cider mix from the packet
Mix the powdered sugar and 2-3 tablespoons of the apple cider until it creates a shiny glaze. Adjust the amount of liquid or powdered sugar in order to reach the consistency of glaze you prefer.
1 cup powdered sugar
Use a fork to drizzle the apple cider glaze over the top of each cookie. Eat warm or cool to room temperature before eating.