Ingredients: 8 Manicotti Pasta Tubes, Uncooked2 Tbsp Extra Virgin Olive Oil1 cup Chopped Mushrooms1⁄4 cup Chopped Onion2 Cloves Garlic, Minced11⁄2 cups Chopped Fresh Spinach1 Egg White3⁄4 cup Grated Parmesan Cheese2 cups Bottled Tomato-Basil Spaghetti Sauce,...