In a medium size bowl whisk together 2 ¾ cup of all-purpose flour, 1/2 cup of powdered sugar, 2 teaspoons of ground cinnamon and ½ teaspoon of kosher salt.
Note: If you are not using a scale to weigh out your ingredients, make sure to properly fluff your flour. If you are packing your cups with flour, the dough will be dry and crumbly.
In the bowl of a stand mixer, combine the brown butter and remaining ½ cup of unsalted butter, ⅓ cup of light brown sugar, and 1 tablespoon of vanilla extract.
Fit the stand mixer with the paddle attachment, then gradually bump the speed up to medium. Beat the butter and brown sugar together for 4 minutes, until the mixture is fluffy and pale in color.
Reduce the speed to low, then add in the flour mixture ¼ cup at a time.
Once all of the flour has been incorporated, scrape down the sides and bottom of the bowl, then beat the cookie dough on medium speed for one final minute.
Line a 9x13 inch baking sheet with parchment.
Use a 1 ½ tablespoon sized cookie scoop to portion out the cookie dough, and space out each portion on the baking sheet about 1 inch apart. I like to leave the cookie dough as scooped so the cracks and valleys stay on the cookies, but if you'd like for your cookies to be smooth and dome, just roll the cookie dough into balls.
Then let the baking sheet with the cookie dough rest in the fridge for 30 minutes.
While the cookie dough chills, preheat the oven to 350 degrees.
Once the cookie dough is ready, bake the cookies for 20-22 minutes, until the cookies are nice and golden brown. Let the baked cookies cool for 5 minutes.