Nonstick vegetable oil spray 2cupsall purpose flour 1/4teaspoonsalt 1cup(2 sticks) unsalted butter, room temperature 1cupsugar 1teaspoonvanilla extract 1large egg yolk 6ouncesbittersweet or semisweet chocolate, chopped 1/2cupfinely chopped red-and-white-striped hard peppermint candies or candy canes (about 3 ounces) 2ounceshigh-quality white chocolate (such as Lindt or Perugina)
Preheat oven to 350°F. Spray 13x9x2-inch metal baking pan with nonstick spray. Line bottom of pan with long strip of 9-inch-wide parchment paper, leaving overhang on both short sides of pan. Whisk flour and salt in medium bowl. Using electric mixer, beat butter in large bowl until creamy, about 2 minutes. Gradually beat in sugar. Continue beating until mixture is light and fluffy, stopping occasionally to scrape down sides of bowl, about 3 minutes. Beat in vanilla, then egg yolk. Gradually add flour mixture, beating on low speed just to blend.
Drop dough by tablespoonfuls into prepared baking pan, spacing evenly. Using moistened fingertips, press dough to form even layer over bottom of pan. Pierce dough all over with fork.
Bake cookie base until light golden brown and slightly puffed and edges begin to come away from sides of pan, about 30 minutes. Place pan on rack; immediately sprinkle bittersweet chocolate over. Let stand until chocolate softens, about 3 minutes. Using small offset spatula, spread bittersweet chocolate over top of cookie in thin even layer. Immediately sprinkle chopped peppermint candies over.
Stir white chocolate in medium metal bowl set over saucepan of simmering water until melted and smooth. Remove from over water. Using fork, drizzle white chocolate all over cookies. Chill until white chocolate is set, about 30 minutes. (I had to put in the freezer to get really set.)
Using paper overhang as aid, lift cookie from pan and transfer to work surface. Using large knife, cut cookie into irregular pieces. DO AHEAD Can be made 1 week ahead. Store in refrigerator in airtight containers between layers of waxed paper or parchment paper.
I'm a recent grad and proud alumna of Louisiana State University living in the nation's capital and working on a Master's Degree. I'm a lover of spending time with family & friends, cooking, things for the home, SEC football, reading and volunteering. I blog about a little bit of all of that on this blog, and sometimes a few extras. I have an opinion about most everything. Southern Living is my love language, diet coke & cheese dip are my vices. I wasn't born in the South, but I got here as fast as I could!