Preheat oven to 325℉ and line a baking sheet with parchment paper.
In a large bowl, whisk together egg, brown sugar, oil and vanilla extract until smooth.
Add flour, baking soda, salt and chocolate chips. Fold with a rubber spatula until just combined and no flour streaks are visible.
Scoop 2 tbsp cookies and flatten until 1 inch thick. Place each cookie at least 2 inches apart.
Bake for around 10 minutes, or until dry in the center and golden brown on the edges.