Milk Bar's Salted Chocolate Chip Cookies

Ingredients (12)

• ½ pound (2 sticks) unsalted butter, melted and just warm to the touch
• ¾ cup packed light brown sugar
• ½ cup granulated sugar
• 1 egg
• 2 teaspoons vanilla extract
• 1 ¾ cups all-purpose flour
• 2 tablespoons nonfat milk powder
• 1 ¼ teaspoons kosher salt
• ½ teaspoon baking powder
• ¼ teaspoon baking soda
• 12 ounces semisweet chocolate chips*
• 1/4 cup flaked salt