I've been holding onto this recipe for a long time so I actually can't remember at all where I got it from so if it's yours, let me know and I'll give you the credit. It's a great way to use those leftover mashed potatoes AND make a weeknight dinner ahead.
1 unbaked pie shell (I use Pillsbury)
2 cups 1% milk cottage cheese
2 cups mashed potatoes
1/2 cup sour cream
2 tsp. salt
1/8 tsp. cayenne pepper (I omitted)
1/2 cup scallions (I omitted)
1/2 cup shredded low fat cheddar cheese
Beat the cottage cheese until smooth. Add in the next 6 ingredients and beat in again until smooth. Stir in the scallions. Pour the mixture into the pie shell and sprinkle with the cheese. Bake at 400 for 45-50 minutes.