Gather all ingredients. Preheat the oven to 350 degrees F (175 degrees C) with racks positioned in middle and lower third. Line two baking sheets with parchment paper.

Stir brownie mix, oil, 3 tablespoons of the flour, eggs, vanilla, and salt in a large bowl until just combined, adding up to 1 tablespoon more flour if dough is too loose; fold in chocolate chips.

Drop dough by rounded tablespoons 2 inches apart onto prepared baking sheets.

Bake in the preheated oven until cookies are just set, about 10 minutes, rotating pans to opposite racks halfway through. Let cool on baking sheets briefly before removing to a wire rack to cool completely.