Vegetarian Lasagna

A good way to get rid of the spinach you bought at Costco and never use because maybe you don't eat as many salads as you should. I obviously need to stop going to Costco.

2 big handfuls of spinach, chopped
1 jar of alfredo sauce--I use Classico sun-dried tomato (or you can make your own)
1/2 cup milk (sometimes I don't add milk--depends on how runny I want it)
1 (8 ounce) package lasagna noodles
1 pint part-skim ricotta cheese
1 egg
8 ounces shredded carrots
8 ounces fresh mushrooms sliced or broccoli or artichoke hearts or zucchini (get crazy with it)
A lot of shredded mozzarella cheese and some parmesan too (or whatever italiany cheese you have on hand)

First:
Preheat oven to 350 degrees F. Spray a 10x15 inch lasagna pan with cooking spray.
Soak the noodles in hot water while you assemble the other stuff.
Place the spinach in a medium bowl. Mix in ricotta. Beat the egg with a wire whisk, and add it to the spinach and ricotta. Stir well to blend.
Combine pasta sauce with milk in a medium bowl. Mix well.
Then I saute the vegetables with some garlic. You don't have to do this. You can just add them in raw but I like to make things difficult plus I bought that big garlic thing at Costco. I know, I know.

Now layer and you can do it however you want but here's one way:
Spread about 1/2 cup pasta sauce mixture evenly in the bottom of the dish.
Place 3 softened noodles over the sauce.
Spread half of the spinach mixture over the noodles.
Sprinkle with half of the carrots and half of the mushrooms.
Sprinkle the cheese.
Place 3 more noodles over the cheese.
Pour 1 1/2 cups sauce over the noodles.
Spread the remaining spinach mixture over the sauce, followed by layers of the remaining carrots and mushrooms and then some cheese.
Place 3 more noodles over the vegetables.
Pour remaining sauce evenly on top.
Sprinkle with the rest of the cheese. Spray a sheet of aluminum foil with cooking spray. Cover the dish tightly with aluminum foil, spray side down.

Now:
Bake for 50 to 60 minutes. Turn the oven off and take off the foil (I'm not sure why this step is necessary and I don't really do it), and place the uncovered dish back into the warm oven for 15 more minutes. Serve at once, or let rest until ready to serve.