Ingredients
3/4 cups unsalted butter, browned and cooled
1 cup dark brown sugar, packed
1/3 cup white sugar
1 egg + 1 egg yolk, room temperature
2 teaspoons vanilla extract
1/2 teaspoon salt
1 3/4 cup all purpose flour
1/4 cup espresso powder
1/2 teaspoon baking soda
4 ounces dark chocolate, roughly chopped