1Heat oven to 375°F. Lightly spray cookie sheet with cooking spray.
2Cook broccoli & cheese sauce as directed on box. Pour into medium bowl; cut up large pieces of broccoli. Stir in chicken.
3Separate dough into 5 biscuits. Press or roll each to form 5 1/2-inch round. Spoon about 1/3 cup broccoli mixture onto center of each round; fold dough over filling, pinching edge and ends of dough well to seal. Place rolls on cookie sheet, seam side down. Place 1 pretzel on cookie sheet under each side of dough rolls for wings. Break pretzels to make antennae; press under top of each roll.
4Bake 12 to 16 minutes or until golden brown. Cool 5 minutes. Use mustard to make eyes and smiles on each butterfly.