• 2 c. prepared marinara sauce, divided
Preheat oven to 325 degrees. Bring a large saucepan filled with water to boil over high heat. When water is boiling, add shells and cook 12 minutes, or until tender but firm. Drain and run cold water over them.
Mix ricotta cheese, 2 tablespoons softened butter, basil, oregano, eggs, nutmeg, Italian cheese, smoked cheese, pine nuts and onion together.
Butter an ovenproof pan just large enough to hold the shells in one layer. Spread 1 cup marinara sauce over bottom of pan. Fill shells with cheese mixture and line them up in the pan over marinara sauce.