Stuff shells with mixture, and put in rows in 9x13 pan (they should be plump, and they fit snug into the 9x13)
Pour Spaghetti Sauce over the top of shells
Bake covered at 300 until center of shells are warm (45 min)
For fun add some garlic to the mixture or Italian seasoning. Have fun with this! It's great with Alfredo poured over the top, too! I have even thrown some cooked sausage in the mixture, or a finger full of Pesto.