Stuffed Shells with Kale and Mushrooms

Make the stuffed shells: Bring a large pot of salted water to a boil. Add the pasta shells and cook until slightly softened but still firm, about 7 minutes. Drain and rinse under cold water. Drizzle with olive oil and toss; set aside.

Heat 2 tablespoons olive oil in a large nonstick skillet over medium-high heat. Add the onion and cook, stirring occasionally, until soft, about 4 minutes. Add the garlic and cook, stirring, 30 seconds. Add the mushrooms and cook, undisturbed, until golden in spots, about 2 minutes. Add 1/4 teaspoon salt and continue cooking, stirring occasionally, until the mushrooms are soft, about 5 more minutes. Add the kale and stir until heated through, about 2 minutes. Let cool completely.

Finely chop the spinach-mushroom mixture and combine in a bowl with the cottage cheese, mozzarella, parmesan, egg, basil and 1/4 teaspoon salt. Stuff each shell with about 2 tablespoons of the filling; set aside.

Preheat the oven to 350 degrees F.

Brush a 9-by-13-inch baking dish with olive oil and pour in half of the tomato sauce. Add the stuffed shells, then top with the remaining tomato sauce. Cover with aluminum foil and bake 25 minutes; uncover and continue baking until bubbly, 15 to 20 more minutes. Turn on the broiler; drizzle the shells with the cheese sauce and broil, about 2 minutes.