**Preheat the Oven:** Preheat your oven to 350°F (175°C) and line a baking sheet with parchment paper or a silicone baking mat.

**Mix the Dough:** In a mixing bowl, combine the brownie mix, Cool Whip, and egg. Stir until a thick, sticky dough forms.

**Chill the Dough:** For easier handling, refrigerate the dough for 20-30 minutes.

**Prepare for Rolling:** Place the powdered sugar in a shallow dish.

**Form the Cookies:** Scoop 1-tablespoon portions of dough and roll them into balls. Coat each ball generously in powdered sugar.

**Bake:** Arrange the coated dough balls on the prepared baking sheet, spacing them about 2 inches apart. Bake for 10-12 minutes, or until the cookies are set around the edges but still slightly soft in the center.

**Cool:** Let the cookies cool on the baking sheet for 2-3 minutes, then transfer them to a cooling rack to cool