Zucchini Ziti

Zucchini Ziti (aimeemo)
3 minced garlic cloves or 1 tsp garlic powder
1/2 cup finely chopped onion
1/2 cup butter
1/2 cup finely chopped green pepper
1 1/2 to 2 lbs zucchini, sliced (I like half moon shape slices.)
3 cups chopped tomatoes
1 tsp salt
1/2 tsp pepper
4 oz sliced white mushrooms
1 lb ziti

Saute onion in melted butter over medium heat for 3 min or until translucent in very large skillet or pot.
Add all other ingredients besides ziti.
Partially cover & cook over low heat for about 30 min, stirring every once in a while. Zucchini should be tender, but still have their shape. Taste test to see if any additional salt & pepper is needed.
Serve over cooked hot ziti.
Grate fresh parmesan cheese over top if desired.