I made a very rich and yummy "Penne" dish the other day -- it will make anyone in here who is dieting cringe.

While the penne was boiling, I mixed up a sauce:
marinara sauce
half and half
a stick of butter (never margarine)
cottage cheese, though more ideally, this would have been ricotta (just didn't have any)
oregano
basil
garlic
a big bag of shredded mozzarella
(To taste, I usually use red wine too, but this turned out pretty tasty right off.)
I got that heated and blended through, and when the penne was ready, mixed it in. This was ad lib -- just hunting through the fridge and throwing things in. I think some small-diced zucchini might have gone well in it too.
I ate some, froze some, and refrigerated some.
Interestingly, that which was refrigerated and warmed up the next day was even better than the first helping fresh from the stove. That time for things to "set" is magic.