Easy Chicken Pot Pie

1 pkg frozen peas & carrots
1 8oz can small whole onions, drained
1 small can mushroom pieces
2 cups cooked & cut-up chicken pieces
2 cups chicken gravy
Pie crust (frozen or homemade)

Combine all ingredients well and pour into 9" pie pan. Cover with pie crust, pressing edges into foil pan. Freeze as is for one hour, remove, wrap with freezer wrap and label, then freeze.

On cooking day:

Remove one and a half hours before baking, remove from freezer to thaw. Preheat oven to 450F. Cover edges of pie crust with foil to prevent the crust from burning. Bake for 1 hour and 15 minutes, or until crust is brown and mixture inside is hot. Remove from oven and allow to sit for ten minutes before cutting and serving.