In large bowl, combine flour, sugar, cocoa powder, baking powder, salt and baking soda. In medium microwave-safe container, combine 1/2 cup Candy Melts Candy and butter. Microwave at half (50%) power 1 minute; stir. Microwave on 50% power in 30-second intervals, stirring between each, until melts are almost melted. Stir thoroughly until mixture is smooth. In medium bowl, whisk together sour cream, eggs and melted candy melt mixture. Add sour cream mixture to flour mixture; stir until just combined. Fill each doughnut cup approximately 3/4 full.