Awesome Spaghetti Squash "Lasagna"

Why I Love This Recipe
I made up this recipe as a way to enjoy one of our favorite dishes - Lasagna - in a much healthier way. All the flavors work so well together, and even my fiance loved it. Yes, it is a healthy "chic" dish but has enough flavor to satisfy a man. The best part is, 1/4 of the recipe is only 437 calories - and that is a huge, filling portion. So go ahead and enjoy!
Ingredients You'll Need
1 medium-large spaghetti squash
10 oz package white mushrooms, washed and sliced
10 oz package fresh spinach
few teaspoons minced garlic
2 links TraderJoe's Sweet Italian Chicken Sausage, sliced thin
28 oz can crushed tomatoes w/basil & garlic (or add your own seasonings)
1/2 cup sundried tomato paste or drained, chopped sundried tomatoes
crushed red pepper to taste
15 oz container part skim ricotta
1/2 cup grated parmesan or pecorino romano
italian seasoning, to taste
Directions
Preheat oven to 400F. Pierce squash with fork and roast for 1 hour. When cool enough to handle, cut in half, remove seeds, and scoop out strings to measure 4 cups. This part can bedone ahead of time, and the scooped out squash can be stored in fridge.
Preheat oven to 350F. Over medium heat, saute mushrooms and garlic for 5-10 minutes. Add spinach and cook until it is wilted. Mix in sausage slices.
Meanwhile, heat crushed tomatoes over medium heat with sundried tomatoes and crushed red pepper.
Mix cheeses and italian seasoning.
Spray a 9x13" casserole with cooking spray. Place half of squash evenly in pan. Cover with half of mushroom mixture, half of cheese, and half of sauce. Repeat with remaining ingredients. Cover tightly with foil. Bake for 30 minutes in convection oven or 45-50 in regular oven.