What about cannelloni? Mix up the quark with one chicken stock cube and add a beaten egg, salt n pepper to taste, wilt the spinach, fry some onions using fry light if you have some. Mix together with the quark.
Fill the cannelloni tubes, the big ones, with the mixture put in a baking dish cover with remaining sauce and shove in oven until pasta cooked?
Im sure this would work as a normal pasta bake with other types of pasta being used too.