Step 1

Preheat oven to 400 degrees F.

Step 2

In a deep skillet or dutch oven, over medium heat, add 2 tablespoons oil. After oil has heated up, add the celery and onion with 2 tablespoons oil, for 5 to 8 minutes. Add the frozen vegetables and cook another 5 minutes. Add flour and cook about 30 seconds.

Step 3

Add chicken broth and bring to a boil. Turn down heat and stir in milk.

Step 4

Add the chicken to vegetable mixture and stir until evenly distributed. Add salt, pepper, poultry seasoning, and thyme..

Step 5

Pour mixture into a 9 inch deep dish pie plate or casserole dish and cover with the pie shell. Be sure to crimp the edges of the pie shell so no juices spill in oven.

Step 6

Bake at 350 degrees F (175 degrees C) for 45 minutes or until pie shell is cooked and golden brown.