Cook broccoli according to package directions, drain &cut into small pieces & set aside.
Melt margarine in 3 qt saucepan. Stir in biscuit mix, ginger, & garlic powder. Then stir in broth & lemon juice. Heat to boiling, stirring constantly. Boil & stir 1 minute; reduce heat. Stir in broccoli, chicken, & mushrooms. Heat through.
Spoon into the sandwich crescents & serve.