Note on brown sugar: The America’s Test Kitchen Cookbook clearly states to use fresh brown sugar as older dried out brown sugar will yield a dry cookie. Another note on ovens: This recipe works best at exactly 350 degrees F. In 12 minutes or so, the cookies are perfectly baked. Most ovens have small temperature drops and increases as the oven works to maintain that temperature. Some ovens do this very well and others not so well. So I experimented and baked each pan slightly differently. The first batch was spot on 350 for the whole 12 minutes and the cookies were perfect. The second batch was baked in an oven that fluctuates a bit and that batch did not puff up or brown as nicely as the first batch. Just suggesting that for this recipe, oven temperature is critical.
2 cups brown sugar, divided (The original recipe called for dark brown sugar, however we used light brown sugar. Also see note above.)
¼ cup granulated sugar
2 cups plus 2 tablespoons all-purpose flour
½ teaspoon baking soda
¼ teaspoon baking powder
½ teaspoon table salt
1 large whole egg
1 egg yolk
1 tablespoon vanilla extract
In a medium sauce pan place 10 tablespoons of butter. Try not to use non-stick or a dark pan so that you can see the color of the butter as it browns. Bring heat to medium high and melt the butter. Once it melts, keep swirling the pan and cook about one to three minutes longer until the color is caramel brown and the smell is toasty. Pour into a large metal bowl and add the remaining cold butter to the browned butter. This butter mixture needs to cool for 15 minutes or so before it can be used. I placed mine in the refrigerator to cool while I measured out the other ingredients.
Place oven rack in center of oven, preheat oven to 350 degrees F. and line two cookie sheets with parchment paper.
In a small bowl, mix ¼ cup of brown sugar with the ¼ cup of granulated sugar. Mix thoroughly making sure there are no lumps and set aside.
In a medium bowl, sift flour, baking soda and baking powder. Set aside.
Once the melted butter has cooled, stir in the remaining brown sugar and salt. Make sure it is fully incorporated.
Use a rubber spatula and scrape down the bowl then add the whole egg, egg yolk and vanilla extract. Mix with the spatula or a wooden spoon to combine.
Scrape the bowl again and add in the flour mixture. Mix until fully combined.
Pour the dough out onto your counter and roll into a log. Cut the log in half. Cut each half into quarters then each piece into thirds, yielding 24 pieces.
Roll each into a ball, roll in the reserved sugar mixture then place on the prepared pans, 12 per pan.
Bake one pan at a time for 12-14 minutes, see note on oven temperature.
Let sit on the pan for five more minutes then transfer to a cooling rack and cool to room temperature (but they are very delicious eaten while still warm).
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