Step 1: Preheat your oven to 350°F (175°C).
Step 2: In a mixing bowl, combine the brownie mix, egg, flour, and water. Whisk until a thick batter forms.
Step 3: Cover the bowl with plastic wrap and refrigerate the dough for about 30 minutes.
Step 4: Line your baking sheet with parchment paper.
Step 5: Using a cookie scoop, drop rounded tablespoons of dough onto the prepared baking sheet.
Step 6: Roll each cookie in powdered sugar before baking.
Step 7: Bake for 10-12 minutes or until edges are firm and centers are soft.
Step 8: Allow to cool on the baking sheet for a few minutes before transferring to a wire rack.