Preheat oven to 350 degrees. Pour 1/2 cup pasta sauce in a large baking dish.
Make the zucchini boats. Cut ends off the zucchini and cut in half lengthwise. Using a spoon, hollow out the center of the zucchini halves, leaving about 1/4-1/2 inch shell. Place flesh side up in baking dish.
Prepare a sauté pan with cooking spray and heat to medium.
Add in onion and ground beef. Cook until browned, 4-5 minutes.
Add diced tomatoes, Italian seasoning, and remaining pasta sauce. Stir to combine.
Stuff the zucchini boats with the beef mixture. Cover pan with foil and bake for 30 minutes until zucchini is cooked through, but still has some firmness.
If adding cheese, remove zucchini from oven and uncover after 25 minutes. Remove foil, add cheese, and return to oven for additional 5 minutes.
Notes
This recipe is 7 Green, Blue, or Purple WW Points. Points include reduced fat cheese.