Pre-heat the oven to 400°F.
Place one pie crust in a pie plate; fit to plate but do not cut off the extra pie crust nor crimp at this point; place in the refrigerator until ready to pour mixture in the bottom crust.
Place pie crust in the refrigerator until ready to add the filling to the pie.
Heat a large skillet over medium heat.
Add olive oil, onions and garlic, and sauté until softened; about 3 minutes.
Add the ground beef and pork; cook until the meat is no longer pink: Drain excess fat.
Add the poultry seasoning, cinnamon, cloves, nutmeg, salt, pepper and reserved potato water; mix well and simmer for about 10 minutes until the liquid is absorbed.
Remove the skillet from the heat, stir in the mashed potatoes; set aside to cool slightly.