Ingredients

  • Olive oil
  • 1 yellow onion, halved and thinly sliced
  • 1 bunch Swiss chard, trimmed, ribs removed and thinly sliced, and leaves chopped
  • Kosher salt
  • 1 pound cremini or button mushrooms, sliced
  • 1 (28-ounce) can crushed tomatoes
  • 2 pounds fresh cheese tortellini
  • 2 cups shredded mozzarella cheese
  • 1/2 cup grated Parmesan cheese
  • Chopped fresh basil, for garnishing (optional)

Method

  • Preheat the oven to 375 degrees F.
  • In a large, deep, ovenproof frying pan over medium heat, warm a glug of olive oil, then add the onion, sliced chard ribs, and a big pinch of salt.
  • Cook, stirring, until starting to turn golden, about 5 minutes.
  • Add the mushrooms and chard leaves and cook, stirring, until tender, about 5 minutes.
  • Add the crushed tomatoes and bring to a simmer.
  • Lower the heat to medium-low and simmer for 10 minutes while you boil the pasta.
  • While the sauce is simmering, bring a large pot of salted water to a boil over high heat.
  • Add the tortellini and cook according to the package directions until just shy of al dente.
  • Drain well.
  • Add the tortellini to the sauce and stir to combine well.
  • Transfer to a 9x13 inch glass baking dish.
  • Top with the mozzarella and parmesan.
  • Bake until bubbly and the cheese is melted and golden, about 20 minutes.
  • Serve garnished with the basil, if you like.