kosher salt
1 tsp. pure vanilla extract
1/2 tsp. instant espresso powder
2 tbsp. whole milk
6 tbsp. unsalted butter
1/4 cup unsweetened cocoa powder
1 1/2 cups powdered sugar
1 1/4 cups semisweet chocolate chips
2 tsp. pure vanilla extract
1 tbsp. whole milk
1 large egg
1 tsp. kosher salt
1/4 cup granulated sugar
2/3 cup light brown sugar
10 tbsp. unsalted butter
1/4 tsp. freshly grated nutmeg
3/4 tsp. baking soda
1 cup white whole wheat flour or whole wheat pastry flour
1 cup all-purpose flour