Place 1/2 cup dark chocolate chips and butter in medium
microwave-safe bowl. Microwave on HIGH (100% power), stirring
every 30 seconds, or until chips are melted (1 to 2 minutes).
Stir until smooth.
In a medium bowl, combine sugar and eggs. Beat at
medium speed until thick and smooth.
Add melted chocolate mixture and continue beating until
Stir in flour and remaining 1/4 cup dark chocolate chips
just until mixed.
Spread batter into prepared pan. Bake for 18 to 22
minutes or until edges are set and center appears soft. (DO
NOT OVERBAKE.) Cool completely.
Meanwhile, in a small bowl, place semi-sweet chocolate
Place whipping cream in 2-quart saucepan. Cook over
medium heat until whipping cream just comes to a boil (3 to 4
Pour warm cream over chocolate chips. Let stand for 1
Stir until smooth. Cool. Spread over cooled
Drop 8 small portions of melted white chocolate randomly
Pull knife through white chocolate to create design.
Cover and refrigerate at least 2 hours or until serving
Carefully lift bars out of pan using foil ends. Cut
into bars using sharp knife. (If necessary, wipe knife
To serve, place small bars into paper mini baking cups.
Store leftover bars in refrigerator