Place the semisweet chocolate and milk chocolate in a medium microwave-safe bowl. Microwave on high for 1 minute. Stir; microwave for 30 more seconds. Stir until chocolate is completely melted.
Stir in the cranberries and pecans. Immediately drop by level teaspoonfuls onto a wax paper-lined baking sheet. Refrigerate until chocolate is set, about 30 minutes. Clusters will keep in the refrigerator up to 5 days.