½ cup
freshly grated Parmesan, plus more for serving
6
basil leaves, minced, plus more for serving
2 cups
roughly chopped spinach
1 (24 ounce) jar
marinara sauce, store bought or homemade
Method
Heat oven to 350°F with a rack in the center position.
Bring a large pot of salted water to a boil over high heat. Cook the jumbo pasta shells until al dente according to the package instructions. Drain.
Meanwhile, heat the olive oil in a large skillet set over medium-high heat. Once the oil is glistening, add the chicken, garlic, Italian seasoning, fennel and salt. Cook, breaking the meat up with a wooden spoon until it cooked through and there is no longer any liquid in the skillet, about 10 minutes.
Transfer the chicken mixture to a large bowl. Stir in the ricotta, 2½ cups mozzarella, and Parmesan cheeses, along with the basil and spinach.
Spread ½ cup tomato sauce in the bottom of a 9x13 baking dish. Stuff each pasta shell with 2 heaping tablespoons of the chicken mixture. Place each stuffed shell openside up in the prepared baking dish. Pour remaining tomato sauce over the stuffed pasta shells and sprinkle with remaining 1½ cups mozzarella cheese.
Bake in the oven until hot and bubbly, about 25 minutes. Serve sprinkled with additional basil and Parmesan cheese if desired.