First set out your 2 pie shells and let them come to room temperature.Then dice your potatoes, celery and onions and set aside.
Brown meat with the onion and celery, just as you meat is half done add potatoes, continue cooking until meat is done. Drain off any fat add mixed vegetables and Lipton onion soup cook on low to med heat until it begins to boil. Mix well your 1/4 cup of water and cornstarch and add to skillet and stir until thickens and remove from heat . Add your salt and pepper to taste.
Take your pie shell as directed on the box and roll out. I press pie crust into a 11 3/4 X 7 3/4 baking dish but a 9 pie dish will work great also.
Pour your in your mixture into the pie crust line dish then top with the 2nd pie shell. If using the oblong dish pull the crust out to sides and corners. Make 3 slit's in the top crust and bake at 375°F until golden brown.