It's rich & buttery, with a dough highlighted by brown sugar & vanilla extract for extra flavor. These cookies are all those things, AND they're gluten-free!
In the bowl of a stand mixer cream together the butter, cream cheese, and brown sugar until light and fluffy. Beat in the egg and yolk one at a time, wiping down the bowl and beater as needed.
Add the dry ingredients to the wet and fold in with a spatula just until mostly incorporated. Add 10 ½ ounces chocolate and fold into batter until just combined and dispersed throughout.
Scoop dough by 2 ounce portions (about 3 tablespoons per cookie) and shape into balls. Divide between the prepared baking sheets with no more than 9 cookies on a single sheet.