Ikea Meatballs

I found this recipe on a blog somewhere and I can't remember where it was, but I plan to try this recipe in the next few days.

1 package prepared frozen meatballs (small grocery store sized bag)
1 can cream of celery soup
1 can french onion soup
8 oz. sour cream
small can sliced mushrooms.

Place in crockpot on low for 6-8 hours and then serve over mashed potatoes or cooked egg noodles.