Preheat the oven to 350 F. Line the two baking sheets with parchment paper.
Beat the butter with a hand mixer with sugar and vanilla for 1 minute.
100 grams butter,, ½ cup brown sugar, 1 tsp vanilla extract
Add one egg and beat until smooth.
1 large egg
Add flour, baking powder, and salt, mix with a mixer.
½ tsp baking powder, ¾ cup gluten-free flour, ¼ tsp salt
Add oat flakes and raisins, mix with a spoon.
1⅓ cup oat flakes, ½ cup raisins
With an ice cream spoon place balls of dough onto a baking sheet, leave room between them because they will spread while baking.
Bake for 10-15 minutes, check a few times. The cookies should be golden brown.
Cool for 2-5 minutes on a baking sheet and transfer to a wire rack to cool completely.