01 -
Heat your oven to 350°F. Line baking sheets with parchment paper or silicone mats.
02 -
Put oats in food processor. Pulse 3-5 times just to break them up a bit - don't turn them into flour.
03 -
Mix oats, flour, baking powder, baking soda, salt, cinnamon, and nutmeg in a large bowl.
04 -
Beat butter and both sugars in a stand mixer with paddle attachment until creamy. Add eggs and vanilla, mix well. Scrape bowl.
05 -
Add dry ingredients to butter mixture. Mix until everything's well combined.
06 -
Drop 2-tablespoon scoops of dough onto prepared sheets, leaving 3 inches between each cookie.
07 -
Bake 9-10 minutes until edges start browning. Let rest a few minutes, then move to cooling rack.
08 -
Whisk powdered sugar and vanilla extract. Slowly add milk until it's thick but pourable.
09 -
Quickly dip tops of cooled cookies in glaze, immediately lift straight up. Let excess drip off. Place on rack until glaze sets.