1. Preheat oven to 350 degrees F. Coat a 9x13 baking dish with cooking spray and set aside. Cook the jumbo shells in boiling water 2-3 minutes short of package directions. Drain and rinse.
2. In a medium bowl, combine the ricotta cheese, 1 cup of Muenster cheese, ½ cup grated Parmesan cheese, Asiago cheese, parsley, salt and pepper. Mix well. Stuff a spoonful of the cheese mixture into each cooked shell. Place the stuffed shells cheese-side-up into the prepared baking dish.
3. Evenly pour the spaghetti sauce over the stuffed shells. Top with 1 cup of shredded Muenster cheese and ¼ cup grated Parmesan cheese. Bake in the preheated oven for 50 minutes. Serve warm with garlic bread and green salad.