These are absolutely my favorite cookies! I made a batch and a half of these a week or so ago. (It made a TON and we are still eating on them!!)
2 cups (4 sticks) butter, softened
1 1/3 cups sugar
1 teaspoon vanilla extract
4 egg yolks
4 cups all-purpose flour
1/2 cup Hershey's special dark cocoa
1 teaspoon salt
1 cup Hershey's special dark chocolate chips or semi-sweet chips
2 tablespoons shortening (DO NOT use butter, margarine, spread or oil), divided
1 cup Reese's peanut butter chips or white chocolate chips
1)Beat butter, sugar, and vanilla until well blended. Add egg yolks, one at a time, beating well after each addition. Gradually add flour, cocoa, and salt, beating until blended. (Batter is very stiff.)
2)Divide dough in half. Shape each part into 12-inch-long log. Roll in wax or parchment paper. Refrigerate 6-8 hours.
3)Heat oven to 350*. Using a sharp knife, cut rolls into 3/8-inch slices. Place on ungreased cookie sheet. Bake 10-12 minutes or until set. Cool slightly. Remove from cookie sheet to wire rack. Cool completely.
4)Place chocolate chips and 1 tablespoon shortening in small microwave-safe bowl. Microwave at MEDIUM one minute. If necessary, microwave at MEDIUM an additional 15 seconds at a time, stirring after each heating, until chips are melted and smooth when stirred. Drizzle over tops of cookies. Melt peanut butter chips with remaining 1 tablespoon shortening; drizzle over cookies. Let stand until drizzles are set. Makes about 6 dozen cookies!
