Pot Pie (Chicken & Biscuits)

Ingredients

• 1 rotisserie-cooked chicken (cooled)
• 4 cups chicken broth
• 4 tablespoons butter
• 4 carrots (sliced)
• 3 ounces mushrooms
• 1 zucchini (sliced)
• 1 cup chopped onion
• 12 cup flour
• 1 tablespoon flat leaf parsley
• 12 tablespoon thyme
• 12 tablespoon tarragon
• fresh ground pepper
• 2 cups flour
• 1 tablespoon baking powder
• 1 teaspoon sugar
• 1 pinch salt
• 12 cup unsalted butter (cold,sliced)
• 1 teaspoon grated lemon zest
• 34 cup milk