impossibly easy turkey and dressing pie

Ingredients For impossibly easy turkey and dressing pie

• 2 c

  leftover turkey, chopped or shredded
• 1/2 c

  chopped celery
• 1/2 c

  chopped onion
• 1/2 tsp

  salt
• 1/4 tsp

  freshly grated black pepper
• 1 tsp

  poultry seasoning
• 1 1/4 c

  milk
• 3

  eggs, beaten
• 1 c

  biscuit baking mix (like bisquick)