Stir in cheese, mustard, salt and pepper; cool slightly.
Flatten each biscuit into a 4-inch circle. Place 8 biscuits on baking sheets. Top with meat mixture.
Using a sharp knife, cut out faces from the remaining biscuit circles. Place over the meat mixture and pinch edges to seal. Use the scraps to form stems.
Bake at 350 degrees F for 10-15 minutes.