Preheat oven to 350 degrees Fahrenheit.
Heat olive oil in large skillet over medium-high heat then add vegetables. Sauté until vegetables are crisp-tender.
Add chicken broth, poultry seasoning, garlic powder and black pepper to skillet. Bring to a boil then simmer for about 5 minutes or until vegetables are tender.
Continue to simmer and add whole wheat flour slowly, stirring constantly.
Add milk slowly, stirring constantly. Add chicken and simmer until sauce is thickened.
Prepare pie crust according for directions.
Place one layer of pie crust in a 9-inch glass pie pan.
Add chicken and vegetable mixture to pie crust.
Add top layer of pie crust and cut six slices into the top of the crust.
Cook for 35-40 minutes or until crust is golden-brown.