Ingredients

  • 6 ounces jumbo pasta shells (about 20 shells)
  • 2 tablespoons olive oil
  • 1/2 medium yellow onion, finely chopped
  • 2 medium garlic cloves, minced
  • 1/2 teaspoon dried oregano
  • 1 teaspoon kosher salt, plus more for salting the water
  • 1/4 teaspoon freshly ground black pepper, plus more as needed
  • 1 pound Swiss chard, stems removed and leaves coarsely chopped
  • 2 cups whole-milk ricotta cheese (about 16 ounces)
  • 3/4 cup loosely packed grated Parmesan cheese, finely grated on the small holes of a box grater (about 2 1/2 ounces)
  • 1 large egg
  • 1 1/2 cups marinara or Basic Tomato Sauce
  • 1/2 cup water

Method

  • Heat the oven to 375 degrees F and arrange a rack in the middle.
  • Bring a large pot of heavily salted water to a boil over high heat.
  • Add the pasta shells, stir, and cook until al dente, about 10 minutes.
  • Place a colander in the sink and drain the shells.
  • Rinse with cold water until cool and then drain well.
  • Transfer the shells to a medium bowl and set aside.
  • Return the colander to the sink.
  • Heat the oil in a large frying pan over medium heat until shimmering.
  • Add the onions, garlic, oregano, 1/2 teaspoon of the salt, and the measured pepper and cook, stirring often, until the onions have softened, about 5 minutes.
  • Add the chard and cook, tossing constantly with tongs, until completely wilted and tender, about 5 minutes.
  • Transfer the mixture to the colander and let sit, stirring occasionally, until cool enough to handle, about 10 minutes.
  • Meanwhile, place the ricotta, 1/4 cup of the Parmesan, the egg, and the remaining 1/2 teaspoon salt in a large bowl and stir to combine; set aside.
  • Place the marinara or tomato sauce and water in a medium bowl and stir to combine; set aside.
  • When the chard mixture is ready, squeeze large handfuls to release any excess liquid and transfer to a cutting board.
  • Finely chop and add to the ricotta mixture.
  • Stir until evenly combined.
  • Taste and season with salt and pepper as needed.
  • Transfer the ricotta-chard mixture to a large resealable plastic bag and snip 1/2 inch off one bottom corner.
  • Evenly spread 1 cup of the tomato sauce mixture on the bottom of a 13-by-9-inch baking dish.
  • Pipe about 2 tablespoons of the ricotta mixture into each pasta shell and place in a single layer, open side up, in the baking dish.
  • (Alternatively, use a spoon to fill the shells.)
  • Pour the remaining tomato sauce mixture evenly over the shells and sprinkle with the remaining 1/2 cup Parmesan.
  • Cover the dish with foil and bake until the sauce just starts to bubble around the edges, about 20 minutes.
  • Remove the foil and continue baking until the sauce is bubbling vigorously and the edges of the pan have started to brown, about 10 minutes more.
  • Remove from the oven and let cool 5 minutes before serving.