Yum, that sounds good Ilene. I love spinach, and have from my garden in the freezer, and some cottage cheese, might have to make this soon!
My favorite low cal pasta sauce is made by sauteeing onions and zuchinni which has been chopped into teeny tiny pieces, then when they're softened, add a can or two of Italian seasoned stewed tomatos - the kind that are chopped fine is better - and let it cook down so there's not a lot of liquid left. Eat. You can doctor this lots of ways. If you use plain tomatos, just add seasonings to taste. I like lots of garlic.
Mushrooms are a good addition too.