Note: Before starting, make sure your butter has completely softened to room temperature where it’s a soft consistency that you can mix. Not melted and not fridge cold.
If you’re making your oat flour from rolled oats, make it first by pouring the oats into a high-speed food processor or blender and process/blend on high for 1-2 minutes until flour forms. It’s ok if a few small pieces of oats remain in the flour that didn’t get blended. Set flour aside.
In a large mixing bowl, add softened butter, and using electric hand beaters, beat the butter for a few seconds on low speed to break it up until it’s just turning creamy.
Add both sugars, egg, and vanilla. Beat on medium speed for 1 minute until well combined, scraping down the sides as needed.
Add oat flour, cocoa powder, baking powder, baking soda, and salt. Beat on low-medium speed for 20 seconds or until a soft cookie dough forms, scraping down the sides as needed.
Add chocolate chips and fold into the batter using a spatula, wooden spoon, or your hands until they’re well distributed.
Transfer bowl with dough inside to your refrigerator to chill for 30 minutes. If your bowl is too large for your fridge, wrap the cookie dough in plastic wrap and chill for 30 minutes.
Preheat the oven to 180ºC (350ºF) after you place the dough in the fridge. Line a flat baking sheet/tray with parchment paper and set aside.
Remove cookie dough from the fridge.
To form the cookies, measure out 1 tablespoon of the dough or 30g (1 ounce) if using a kitchen scale.
Roll into a ball and then flatten it in the palm of your hand into a disc (refer to in blog process images for a visual). Place on the lined tray.
Repeat with remaining cookie dough, leaving a 2-inch (5cm) gap between each cookie to allow for spreading.
If desired, place a few extra chocolate chips onto each cookie.
Bake cookies for 13-15 minutes. They will be just set in the middle but still look soft. They’ll also be slightly darker around the edges.
Remove from the oven and allow to cool on the baking tray for 10 minutes.
Gently transfer cookies to a wire rack to cool completely.
Enjoy!