Microwave chocolate and butter in large microwaveable bowl on HIGH 2 min. or until butter is melted; stir until chocolate is completely melted and mixture is well blended.
Add sugar; mix well. Beat in eggs, 1 at a time.
Add combined flour and baking powder; mix well. (Dough will be very soft.) Refrigerate 2 hours.
Heat oven to 350F.
Roll heaping teaspoonfuls of dough into 1-inch balls.
Place, 2 inches apart, on baking sheets sprayed with cooking spray.
Bake 10 to 12 min. or until tops are set. (Do not overbake.) Immediately sprinkle with crushed candy. Cool 1 min. on baking sheets.