Preheat oven to 375 degrees F. Line baking sheet with parchment paper or silicone baking mat.
In a medium bowl combine flour, baking powder, salt, cinnamon and nutmeg and whisk together.
In a separate large bowl combine butter, sugar and brown sugar and use a mixer to beat until light and fluffy. Add in vanilla extract and one egg at a time, mixing between each. Scrape down sides of bowl as needed.
Add in the flour mixture and mix until fully combined. Add in the oats and mix again until nice and thick and combined.
Fold in the raisins and scoop into full tablespoon size balls, about 2 inches apart. Bake for 12 to 15 minutes, until the edges are slightly browned. Let cool on pan for a few minutes before transferring to a wire rack to cool completely. Store in an airtight container.