Oven to 350. Cook noodles 7 minutes, rinse in cool water. Heat oil add mushrooms, peppers, garlic and spinach. Stir together egg whites, ricotta and basil. Stir in mushroom mixture. Pour 3/4c sauce in bottom of 9x13 baking dish. Stuff shells and place on top of sauce. Pour remaining sauce over shells and sprinkle with cheeses. Bake 30 min covered, uncover and bake for 10 more minutes. 13 servings
Husband and kids ate it so it must be a hit! Chopped the peppers and mushroom really tiny like secret ingredients. The directions leave a little to be desired - chop ahead of time and you'll be fine.