This recipe is made from leftover creamed spinach from your holiday party. The whole idea of turning your leftovers into something completely different, brings new life to a dish that would have otherwise have been tossed in the trash!
If making this from scratch, simply use 1 package of thawed and drained, frozen chopped spinach, saute one finely diced onion with 1-2 cloves of minced garlic with 2 tsp salt. Add to the spinach. Then, add the Mascarpone cheese, shaved Parmesan cheese and 1 cup of ricotta cheese.
Stuff shells like stated above and follow the rest of the instructions.