Taco Pasta Shells

I wrote down this recipe from who-knows-where a long time ago but forgot all about it.  I wish I hadn't!  It's a new family favorite.  Tasty and filling.  All five thumbs up!  (And no judging the photo.  We were in a huge hurry.  Grin.)

1 lb ground beef

3 oz cream cheese

1 t salt

1 t chili powder

18 jumbo shells

2 T butter

1 c taco sauce

1 c shredded cheddar

1 1/2 c crushed tortilla chips

8 oz sour cream

Cook beef in skillet.  Add cream cheese, salt and chili powder.  Mix and simmer 5 minutes.  Boil shells according to package.  Toss cooked shells in butter.  Preheat oven to 350 degrees.  Fill shells with beef mixture and arrange in 9 x 13; pour taco sauce on top.  Cover with foil and bake 15 minutes.  Add cheese and chips; bake 15 more minutes.  Top with sour cream and serve.