Beat together the butter, lemon extract, cream cheese, and egg until well combined.
Add the cake mix to the bowl and beat to mix.
Chill the cookie dough for at least 30 minutes.
When ready to bake, preheat the oven to 350 degrees. Scoop the dough into a ball and roll each ball in powdered sugar.
Line a baking sheet with parchment paper and place each coated cookie on the baking sheet. Bake for 10 to 12 minutes, until the edges are just beginning to brown.
Allow the cookies to cool on the baking sheet for 5 minutes, then transfer to a wire cooling rack to cool completely. Top with additional powdered sugar before serving.