Preheat the oven to 365°F. Line a baking sheet with a silicone mat or parchment paper.
In a large bowl, stir the brownie mix, 1/4 cup flour, 14/ cup oil, and 2 large eggs until combined. Fold in 1/2 cup chocolate chips. The consistency should be slightly thicker than a typical brownie batter. If the batter is too thin (falling easily off the spoon), add an extra 1 to 2 Tablespoons. If the batter is too thick to stir, add in 1 to 2 Tablespoons water.
Using a large cookie scoop or spoon,scoop the dough onto the baking sheet. Top with additional chocolate chips, if desired. Bake 8 to 10 minutes, or until the cookies are set.
Let cool a couple minutes on the baking sheet and then transfer to a cooling rack to cool completely.
Notes
Variations: Mix in 1/2 cup M&M's and 1/2 cup chocolate chips. or 1/2 chopped nuts.If your brownie mix calls for added water, you may need to add one tablespoon of water if the batter seems dry and crumbly.Storage: Store in a covered container up to 3 days.Freezing: Store cooled cookies in a freezer safe bag or container for up to 3 months. Thaw at room temperature for about 30 minutes.