Step 1

Melt the butter in a large pan over medium high heat. Add as much spinach as will fit in the pan and cook until it wilts. Continue adding handfuls of spinach to the pan until it's all wilted. Season with salt and pepper to taste.

Step 2

Let the spinach cool slightly, then squeeze the excess water out of the spinach. Coarsely chop the spinach.

Step 3

Place the spinach, ricotta, eggs, Parmesan, 1 cup mozzarella, salt, pepper and Italian seasoning in a large bowl. Stir to combine.

Step 4

Cook the lasagna noodles according to package directions.

Step 5

Preheat the oven to 375 degrees F. Coat a 9"x13" pan with cooking spray.

Step 6

Spread a small amount of sauce on the bottom of the pan. Add a layer of noodles, then spread 1/3 of the cheese mixture over the noodles.

Step 7

Top the cheese mixture with 1/3 of the marinara sauce.

Step 8

Repeat the layers, ending with the marinara sauce.

Step 9

Cover the lasagna with foil, then bake for 45 minutes.

Step 10

Uncover the lasagna, then add the remaining 2 cups of mozzarella cheese. Bake for an additional 15 minutes or until cheese is melted and browned.

Step 11

Sprinkle lasagna with parsley. Let stand for 5-10 minutes, then cut into slices and serve.