Here's my version of the pie:

1# ground beef
1 pkg onion soup mix
12oz any frozen vegie (we like corn best)
1 can cream of mushroom soup
mashed potatoes

Brown meat, add both soups with 1 can milk. Cook for about 5 minutes on low. Put this in the bottom of 9x13 pan, put frozen corn over top and finally put the prepared potatoes on top. Bake in 350' oven for 20 minutes, it's best to not let the potatoes brown. Very easy to make when you don't have alot of time!