Oat Cookie

Directions

1. 1
   Heat the oven to 350F.
2. 2
   Combine the butter and sugars in the bowl of a stand mixer fitted with the paddle attachment and cream together on medium-high for 2 to 3 minutes, until fluffy and pale yellow in color.
3. 3
   Scrape down the sides of the bowl with a spatula.
4. 4
   On low speed, add the egg yolk and increase the speed to medium-high and beat for 1 to 2 minutes, until the sugar granules fully dissolve and the mixture is a pale white.
5. 5
   On low speed, add the flour, oats, baking powder, baking soda, and salt.
6. 6
   Mix for a minute, until your dough comes together and any remnants of dry ingredients have been incorporated.
7. 7
   The dough will be a slightly fluffy, fatty mixture in comparison to your average cookie dough.
8. 8
   Scrape down the sides of the bowl.
9. 9
   Pam-spray a quarter sheet pan and line with parchment, or just line the pan with a Silpat.
10. 10
    Plop the cookie dough in the center of the pan and, with a spatula, spread it out until it is 1/4 inch thick.
11. 11
    The dough wont end up covering the entire pan; this is OK.
12. 12
    Bake for 15 minutes, or until it resembles an oatmeal cookiecaramelized on top and puffed slightly but set firmly.
13. 13
    Cool completely before using.
14. 14
    Wrapped well in plastic, the oat cookie will keep fresh in the fridge for up to 1 week.