Active Time

　　40 minutes

　　Total Time

　　1 hour 45 minutes (plus cooling time)

　　This lasagna recipe has just the right mix of hearty sausage, vibrant spinach, and a perfectly balanced three-cheese blend. With a quick-cooking sauce and no-fuss, no-boil noodles, the assembly is easy, and one pan feeds a large crowd.

　　If you want to get ahead, the sauce can be prepared up to 2 days in advance and refrigerated. The filling can be prepared up to 1 day in advance and refrigerated.

　　

Ingredients

Makes 8 to 10 servings

　　

For the sauce:

1 tablespoon extra-virgin olive oil

　　1 pound sweet Italian sausage, casings removed

　　1 medium onion, chopped

　　3/4 teaspoon kosher salt

　　1/4 teaspoon freshly ground black pepper

　　4 garlic cloves, minced

　　1/2 teaspoon red-pepper flakes, plus more to taste

　　2 tablespoons tomato paste

　　Two 28-ounce cans whole tomatoes

　　2 teaspoons dried oregano

　　

For the filling:

Two 15-ounce containers part-skim ricotta cheese

　　1 1/2 cups packed basil leaves

　　1/2 cup grated Parmesan (about 2 ounces)

　　2 large egg yolks

　　3/4 teaspoon kosher salt

　　1/4 teaspoon freshly ground black pepper

　　

For the assembly:

2 10-ounce packages frozen chopped spinach, thawed, or 1 1/2 pounds fresh spinach, steamed

　　Pinch kosher salt

　　Vegetable-oil cooking spray

　　9 no-boil lasagna noodles (such as Barilla)

　　1 pound fresh mozzarella, grated (about 4 cups)

　　

Special equipment:

9 x 13 x 2-inch baking dish, preferably glass

　　

Preparation:

Step 1

Position the rack in the upper third of the oven and preheat to 375°F.

　　

Make the sauce:

Step 2

In a large pot over medium-high heat, heat the oil. Add the sausage, onion and 3/4 teaspoon salt and 1/4 teaspoon pepper; cook, breaking up sausage with a wooden spoon, until browned and cooked through, 8 to 10 minutes. Reduce heat to medium and add garlic, red-pepper flakes, and tomato paste; cook, stirring often, until fragrant, 1 to 2 minutes more. Add tomatoes (along with their juice) and oregano; bring to a simmer, and cook, breaking up the tomatoes with a wooden spoon until in small pieces, about 5 minutes. Taste and adjust seasoning, adding more red-pepper flakes if desired.

　　

Make the filling:

Step 3

In the bowl of a food processor, combine all of the filling ingredients and process until mostly smooth. 

　　

Assemble the lasagna:

Step 4

Squeeze the spinach in a paper towel or clean dishcloth until very dry. Transfer to a bowl and season with a pinch of salt.

　　

Step 5

Coat baking dish with cooking spray and spread the bottom with 2 cups sauce. Top with a layer of three noodles, then a third of the ricotta mixture (about 1 1/3 cups), and a third of the spinach (about 2/3 cup). Sprinkle with 1 cup grated mozzarella.

　　

Step 6

Repeat twice more, skipping the mozzarella on the third layer. Top the lasagna with the remaining sauce. Sprinkle the remaining 2 cups mozzarella in clusters so some of the sauce peeks through.

　　

Step 7

Place the baking pan on a rimmed baking sheet. Lightly spray a piece of foil with cooking spray, cover the lasagna, and bake for 45 minutes. Remove the foil and continue baking until lightly browned and bubbly, about 20 minutes more. Let cool at least 10 minutes before serving.