1Heat oven to 400°F. Generously grease 12 muffin cups (2 3/4x1 1/4 inches). In medium microwavable bowl, microwave chocolate chips and butter uncovered on High 45 to 60 seconds or until melted and mixture can be stirred smooth.
2In large bowl, beat eggs and egg yolks with wire whisk or electric mixer until foamy. Reserve chocolate syrup pouch from brownie mix. Gradually beat dry brownie mix into egg mixture until well blended. Gently stir in melted chocolate mixture. Fill muffin cups half full of brownie mixture; top each with 1/2 teaspoon decors. Top with remaining brownie mixture.
3Bake 10 to 12 minutes or until edges are set and internal temperature is at least 160°F. DO NOT OVERBAKE. Centers will be soft. Cool 2 minutes.
4Loosen each cupcake with knife; turn upside down onto heatproof tray or cookie sheet. To serve, place cupcake on plate; drizzle with reserved chocolate syrup and top with additional decors.