Preheat your oven to 375°F (190°C) and line two baking sheets with parchment paper.

Combine flour, baking powder, salt, and apple pie spice in a medium bowl; whisk together.

Cream together unsalted butter, granulated sugar, and light brown sugar until light and fluffy.

Add eggs and vanilla extract to the butter-sugar mixture and mix until fully blended.

Gradually mix in the dry ingredients until just combined; avoid overmixing.

Fold in oats and raisins until evenly distributed throughout the dough.

Using a cookie scoop, portion dough onto prepared baking sheets about 2 inches apart.

Bake for 12-14 minutes, until edges are slightly golden. Remove from oven and cool for 5 minutes before transferring to wire racks.