Bring water to boil in a large stockpot. Add salt and 1 tablespoon of olive oil to water. Add pasta to water, stirring often to prevent the pasta from sticking. Boil for about 10-15 minutes or until the shells are al dente. Drain shells from water.
Preheat oven to 350º F. Spray a 9x13 baking dish with nonstick cooking spray. Set aside.