Preheat the oven to 400 degrees. Cook the pasta according to package directions. Drain and run under cold water to cool. Spread the marinara sauce in the bottom of a large baking dish. In a bowl, combine the ricotta, spinach, Paremesan, 1/2 Teaspoon salt and 1/4 teaspoon pepper. Spoon the mixture into the shells and place them on top of the sauce. Sprinkle the shells with mozzaerlla and bake until heated through, 10 to 12 minutes. Increase heat to broil. Broil shells until cheese begins to brown, 2 to 5 minutes.
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