Ingredients

2 1/4 cups flour
1/3 cup cocoa powder
1/2 teaspoon baking soda
1/2 teaspoon baking powder
1/4 teaspoon salt
3/4 cup unsalted butter, softened
1 cup sugar
1 egg
4 ounces semi-sweet chocolate, melted and cooled
3 ounces semi-sweet chocolate, finely chopped
1 teaspoon vanilla extract
3 ounces white chocolate, finely chopped

Directions

In a medium bowl, whisk together flour, cocoa, baking soda, baking powder, and salt. In another bowl, beat butter and sugar until creamy, about 2 minutes with an electric mixer. Beat in egg, 4 ounces of melted chocolate, and vanilla. Gradually beat in flour mixture until blended. Divide dough in half. Shape each half into a roll 2″ in diameter. Wrap rolls in waxed paper and freeze for 4 hours or until very firm. Preheat oven to 350F. Line two baking sheets with foil and coat them with cooking spray. Cut dough into 1/4″ slices. Arrange 1″ apart on prepared baking sheets. Bake cookies 10 to 11 minutes. Cool on sheets for 1 minute then transfer to wire racks to cool completely. Repeat process until all cookies are baked. To decorate the cookies, place the chopped milk chocolate in one small zip-lock baggie and the white chocolate in another. Microwave on high 1 minute or until chocolate is melted. Knead until smooth. Snip off a tiny corner of each bag and drizzle chocolate over cookie. Let cookies stand until chocolate is firm, about an hour.