Page 208 - My Cookbook

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