Make the cookies by mixing the flour, ginger, baking soda, cinnamon, and salt in a bowl until well combined. Set aside.
Beat the butter and sugar together until creamy with a hand mixer (or stand mixer), about 2 minutes.
Gradually beat in the egg and molasses.
Slowly add a bit of the flour mixture into the butter mixture, and mix to combine.
Add the remaining flour mixture and mix until a soft dough forms.
Refrigerate the dough for at least 45-60 minutes.
Preheat oven to 350 degrees. Line a baking sheet with parchment paper.
Once the dough is chilled, roll the dough into 1-inch balls.
Coat each cookie ball in the cinnamon-sugar mixture.
Place 2 inches apart on the baking sheet.
Bake until the tops are slightly rounded and cracked, about 10 minutes.
Remove from the oven and let them sit for a few minutes, then move to a wire cooling rack to cool.
Prepare the apple glaze by whisking the powdered sugar and apple juice together in a small bowl. Add more powdered sugar if needed for a thicker glaze.
Drizzle the cookies with the glaze once they have cooled.