These rich and cheesy spinach and ricotta-stuffed shells are the ultimate Italian comfort food. Substitute various cheeses, such as Asiago or feta, in place of Parmesan and other dried herbs, such as thyme, basil, or dill, in place of oregano.
Spread 1/2 cup Basic Marinara over bottom of a 13 x 9-inch baking dish coated with cooking spray.
Combine ricotta and next 8 ingredients (through garlic) in a large bowl, stirring well. Spoon about 1 1/2 tablespoons filling into each pasta shell. Arrange stuffed shells in prepared dish; spread with remaining 1 1/2 cups Basic Marinara. Cover and bake at 350° for 30 minutes. Let stand 5 minutes before serving.