Add enough spaghetti sauce to coat the zucchini and onions. Heat until warm.
Spoon onto bread and top with cheese (optional)
Enjoy!
Notes
Construct the sandwiches and wrap in foil. Place in the oven at 250 degrees F for 15 minutes for cheese to melt (If you used cheese). Or to simply keep the sandwiches warm.
This is a fun recipe that you can save the left overs for a second meal. For your second meal, cook some rice. Top the rice with the zucchini, onion, sauce mixture!