In a Medium or Large Ziploc® Zip 'n Steam™ Bag, combine carrots, brown sugar, butter, cornstarch and salt. Seal bag and shake gently to combine ingredients. Pat carrots into a single layer. Place in microwave oven.
Cook on full power for 6 minutes for crisp-tender carrots. If needed, continue microwaving at 30-second intervals until carrots have reached desired level of tenderness. Allow bag to stand 1 minute before handling. Shake gently to coat carrots with glaze. Carefully open bag. Garnish with parsley if desired.