Preheat your oven to 375°F. Prepare a large, rimmed baking sheet with parchment paper or a Silpat baking mat.
Cream together the butter, brown sugar, and granulated sugar in a large bowl.
Add the eggs and vanilla extract to the mixture, mixing on low speed.
In a separate bowl, combine the quick oats, all-purpose flour, pumpkin pie spice, baking powder, baking soda, and salt. Then, gradually add to the wet mixture.
Stir the raisins into the dough until evenly distributed.
Cover and chill the dough in the refrigerator for 30 minutes.
Divide the dough into 24 equal-sized balls and arrange them on the prepared baking sheet, pressing each slightly flat with the bottom of a glass.
Bake in the preheated oven for 8 to 10 minutes, or until golden brown.
Transfer the cookies from the baking sheet to a wire rack to cool for 10 to 15 minutes before serving.