Preheat oven to 350 degrees and line a baking sheet with parchment paper or a silicone mat.
In a large bowl, combine brownie mix with flour, eggs, vegetable oil, water, and chocolate chips. Mix with a wooden spoon until just combined, taking care not to over-mix.
Scoop roughly 1 ½ Tbsp cookie dough (I use a #40 cookie scoop) onto prepared cookie sheet, at least an inch apart.
Bake for 10-12 minutes, until edges of cookies are set, but centers are still soft.
Cool on baking sheet for a few minutes before moving to a wire rack to cool completely.