It's the tofu-spinach manicotti from Joanne Stepaniak's The Ultimate Uncheese Cookbook, and I lefto out the marjoram, and used portobello mushrooms because believe it or not, they were the cheapest mushrooms at the Berkeley Bowl today, at $1.49 a pound.
The recipe calls for 12 shells, and my box had 14. Only 12 would fit in my pan, so I didn't try to stuff all 14 shells. I ended up with extra filling. I took the extra noodles, opened them up, and made a little "lasagne" for myself for work tomorrow out of the remaining noodles and filling, with a little sauce on top.