In the bowl of stand mixer with a paddle attachment, add the sugar and oil. Mix well.
Add the starter, vanilla extract, and eggs. Mix until well combined.
You can also easily mix these by hand in a large mixing bowl.
In a separate bowl, add the flour, oats, baking powder, baking soda, and salt. Mix well.
Turn mixer on low and slowly add the flour mixture.
After the flour mixture is combined, add the raisins and pulse the mixer a few times to incorporate them evenly throughout the cookie dough.
Line a baking sheet or cookie sheet with a parchment paper.
Using a small cookie scoop add the cookie dough.
Place cookies in the fridge for at least 15-30 minutes before baking while oven preheats.
Place in the fridge for 30 minutes or up to several days for a long fermented method. *Alternatively, you can place the dough as soon as it is mixed in the fridge for several days before scooping out and baking*
Preheat the oven to 350 degrees F.
Bake the cookies for 12-15 minutes or until the edges start to brown.
Let cookies cool completely on a wire rack before storing.