Preheat oven to 350°F (175°C). Line a baking sheet with parchment paper.

In a large bowl, mix brownie mix, eggs, vegetable oil, and flour until just combined. Fold in nuts or chocolate chips if using.

Drop spoonfuls onto baking sheet, spacing 2 inches apart.

Bake 9-11 minutes until edges are set but centers still soft.

Cool on sheet 5 minutes, then transfer to wire rack to cool completely.

Serve and enjoy!