Instructions

  1. Bring a large pot of lightly salted water to a boil. Place the farfalle (aka bow ties) into the pot, cook 8 to 10 minutes, until al dente, and drain.
  2. Preheat oven to 350 degrees Fahrenheit.
  3. Lightly grease 14 x 11 1/2 x 2 1/4-inch baking dish (or two 8x8-inch pans) and set aside.
  4. Heat olive oil in a very large heavy skillet over moderate heat 1 minute.
  5. Add onion and garlic. Stir-fry until limp, about 3 minutes.
  6. Add mushrooms and stir-fry until juices are released and evaporate, about 5 minutes.
  7. Add beef and cook and stir, breaking up clumps, until no longer red, about 5 minutes.
  8. Off heat, mix in tomato sauce and all but 1 cup cheese.
  9. Transfer to baking dish, add bow ties, and toss gently but thoroughly to mix.
  10. Scatter remaining 1 cup cheese on top.
  11. Bake, uncovered, until browned and bubbling, 35-40 minutes, and serve.