Preheat oven to 375 degrees F. Prepare a large baking sheet with parchment paper. In a mixing bowl, cream the oil (or softened dairy free plant butter), brown sugar, and sugar until well blended.
Beat the egg in a bowl with a fork and then pour into the mixing bowl with vanilla, incorporate together. In a separate bowl, whisk together the flour, baking soda, and salt. Add to the mixer bowl and beat until well mixed and creamy, about 3 minutes.
Fold in chocolate chips. Chill in fridge for 60 minutes ideally to prevent spreading. Use a cookie scoop to equally portion the cookie dough into balls. Put the cookie dough onto the prepared baking sheet about 2 inches apart. Will make 12-15.
Bake for 9 minutes before removing from the oven. Allow the cookies to cool completely on the baking sheet as they will continue to cook from the residual heat. Store in an airtight container for up to one week.