Zucchini Pizza Casserole

We still have a few zucchini in the garden..so this is one last chance to try out something new with it.
It is especially good with Italian sausage, but you could also use ground beef if you prefer.

4 c. shredded unpeeled zucchini
1/2 t. salt
2 eggs
1/2 c. parmesan cheese, shredded
2 c. mozzarella cheese, shredded
1 c. shredded cheddar cheese
1 # ground Italian sausage
1/2 c. chopped onion
1/2 c. chopped red pepper
1 15 0z. can tomato sauce
2 t. Italian seasoning

Put zucchini and salt in a colander and let drain for 10 minutes.  Press on the zucchini to force out any liquid.  In a bowl mix zucchini, eggs, Parmesan cheese, 1/2 cheddar cheese, and 1 c. mozzarella cheese.
Press the zucchini mixture into a 13 x 9 baking dish that has been spreayed with cooking spray.
Bake at 400 degrees for 20 minutes.  While it is baking place sausage, onion and pepper into a saute pan and cook until sausage is no longer pink.  Stir in tomato sauce and allow to simmer on low.
When the zucchini mixture is done, pour the sausage mixture over the top.  Sprinkle with remaining 1/2 c. cheddar cheese and mozzarella cheese.  Bake at 400 degrees for an additional 20 minutes.