Remove stems from mushrooms, clean and set aside. 

In a bowl mix ground chicken with hoisin sauce and scallions. 

With a spoon scoop one tablespoon of the chicken mixture into every mushroom cap. 

Bake at 400°F for 20 minutes or until chicken is cooked through. 

Prepare hoisin glaze: Mix one tablespoon of water with 2 tablespoons of hoisin sauce and glaze the top of the mushrooms, then pop them in the oven on a broiler setting for a minute or two till slightly browned. 

To serve: Skewer the mushrooms and garnish with sesame seeds and fresh scallions.