To prepare ginger-sugar mixture: In a small bowl, combine 1 teaspoon ground ginger and granulated sugar, reserving 1 teaspoon for glazing cashews.
To prepare whiskey glazed cashews: Preheat oven to 325 degrees and line a rimmed baking sheet with parchment paper. In a medium bowl, combine maple syrup, 1/2 teaspoon whiskey, 1 teaspoon ginger-sugar mixture and kosher salt. Toss cashews in whiskey mixture until well coated. Spread cashews on prepared baking sheet and bake until golden, 6 to 8 minutes. Remove from oven and cool completely. Chop cashews into small pieces and reserve.
To prepare cookies: When ready to bake, preheat oven to 350 degrees and line baking sheets with parchment paper.
Shape dough into 1-inch balls. Dip the top half of each ball into ginger-sugar mixture and place dough 2 inches apart on prepared baking sheets. Bake until edges are lightly brown and tops are lightly cracked, about 8 to 10 minutes. Remove from oven and cool 2 minutes before transferring cookies to a wire rack to cool completely.
To prepare icing: In a bowl of an electric mixer on medium-high speed, beat 1 tablespoon butter, cream cheese, 1 teaspoon ground ginger and 1 1/2 teaspoons whiskey until creamy. Reduce speed to low and slowly add powdered sugar. Add half-and-half (or milk), 1 teaspoon at a time, to reach desired consistency.
To assemble cookies: In a small bowl, stir together remaining 1/3 cup crystallized ginger with chopped whiskey glazed cashews.