Crunchy Oatmeal Raisin Cookies are crunchy, crumbly cookies loaded with oats and raisins. These are perfect for those who crave that satisfying crunch in a cookie.
Preheat oven to 320F/160°C. Line baking sheets with parchment paper or silicone baking mats.
Using a hand mixer or stand mixer fitted with a paddle attachment, cream together butter and brown sugar on high speed until pale and fluffy.
Add egg yolk and vanilla. Beat the mixture until well combined.
Sift in cake flour, ground cinnamon, baking powder, and salt. Beat on low speed just until combined. Don't overmix.
Add oats and raisins. Mix with a spatula until combined.
Scoop 1 tablespoon of dough and roll into balls. Arrange the balls onto the prepared pan, leaving about 2 1/2 inch/6.5 cm of space between the cookies.
Flatten the dough ball with a fork. Make sure the flattened dough still has at least 1 inch/2.5 cm of space between because the cookies will spread a little during baking.
Bake the cookies for 25-30 minutes. Remove from the oven.
Transfer the cookies immediately onto a cooling rack and cool them completely before transferring them into an airtight container.