Preheat oven to 350 degrees.
On a lined baking sheet, bake meatballs for 10-15 minutes, to warm them.
Place one of the pie crusts in a baking dish, reserving the other crust for the top.
Spread the bottom of the pie crust with a thin layer of sauce.
Next layer the sauce with 4-5 slices of cheese.
Add meatballs, starting from the outer edge and moving into the middle.
Coat with another layer of sauce and 4-5 more slices of cheese.
Top with pie crust making sure to pinch the bottom and top pie crusts together.
Brush the top crust with egg wash.
Bake 1 hour.
Remove from oven and let cool for 5 minutes.