Step 1

Preheat oven to 350 degrees F.

Step 2

Put lasagna noodles in a large baking dish and pour boiling water over the top until they’re submerged. Let soak for 15 minutes, then rinse with cold water and set aside.

Step 3

As noodles soak, add olive oil to a large pot over medium heat. Add the diced onion and garlic and cook until fragrant, about 4-5 minutes. Pour in the pasta sauce, then add the Italian seasoning. Continue simmering for 5-6 minutes until the sauce has slightly reduced.

Step 4

In a medium-sized bowl, add the drained spinach, ricotta, 2 cups mozzarella, ½ cup parmesan, egg, and salt. Stir until fully combined.

Step 5

For assembly: Spread a thin layer of sauce across the bottom of a 9x13 baking dish.

Step 6

Arrange 3 noodles across the sauce and then top with ⅓ of the cheese mixture, followed by another thin layer of sauce.

Step 7

Place 3 more noodles on top and repeat the process of layering the cheese and sauce, finishing with a layer of noodles and then sauce on the very top.

Step 8

Tightly cover the dish with foil and bake for 45 minutes.

Step 9

emove from over and remove foil. Sprinkle the remaining cheese on top and bake for an additional 15-20 minutes or until cheese is bubbling and starting to turn golden brown.

Step 10

Allow lasagna to cool for 10-15 minutes before slicing.