HOT COCOA COOKIES Makes about 60 pieces  Ingredients 1 stick unsalted butter 12 oz. semisweet chocolate, chopped 1 1/2 cups flour 1/4 cup unsweetened cocoa powder 1 1/2 teaspoons baking powder 1/4 teaspoon salt 1 1/4 cups (packed) light brown sugar 3 eggs, at room temperature 1 1/2 teaspoons pure vanilla extract 7.5 oz. semisweet…