Ingredients
16 tablespoons (227g) unsalted butter, at room temperature
1 cup (213g) light brown sugar, packed
1/2 cup (99g) granulated sugar
1 large egg, at room temperature
1 large egg yolk, at room temperature
1 tablespoon (14g) vanilla extract
2 cups (240g) all purpose Gluten Free flour
1 cup (89g) rolled oats (I usually add another 50 grams for texture)
1 teaspoon baking powder
1 teaspoon baking soda
1 teaspoon kosher salt or 3/4 teaspoon table salt
3 cups (510g) semisweet chocolate chips
Preparation and Baking
Preheat the oven to 325°F. Line several cookie sheets with parchment paper, or lightly grease with non-stick vegetable oil spray.
In a large bowl or the bowl of your stand mixer, beat together the butter and sugars until smooth.
Beat in the egg, egg yolk, and vanilla.
Whisk together the flour, oats, baking powder, baking soda, and salt, and add to the butter mixture in the bowl.
Mix until everything is thoroughly incorporated. Scrape the bottom and sides of the bowl, and mix briefly.
Stir in the chocolate chips.
Scoop the dough onto the prepared baking sheets, leaving about 1 1/2" to 2" between cookies.
Bake the cookies for 12 to 17 minutes, until they're a light golden brown, with slightly darker edges. Their middles may still look a tiny bit shiny; that's OK, they'll continue to bake as they cool on the pan.
Remove the cookies from the oven, and as soon as they're set enough to handle, transfer them to racks to cool.