Heat oven to 350 Fahrenheit. Wet ingredients. In a bowl of a stand mixer with the paddle attachment beat the butter, both sugars until creamy (medium speed). About 2 minutes.
Add egg, vanilla extract to the butter mixture and beat again on low. Dry ingredients. In a medium bowl whisk together sifted flour, oats sifted baking soda, sifted baking powder, salt, mix well and set aside.
Add the dry ingredients in batches to the wet ingredients until thoroughly combined. Stir in raisins with a spatula.
Chill in the freezer for 15-30 minutes. Roll the dough into 12-13 balls. Don't press them down. Bake for 10-12 minutes until they start turning golden brown.