Cut Spaghetti Squash in half lengthwise. Scoop out all seeds.
Spray all sides of each half of Spaghetti Squash with cooking spray and place face down on a cookie sheet. Bake for 20-30 minutes, until skin can be easily pierced with a knife.
Once cool enough to handle, use a fork to scrape out the "spaghetti" like flesh of each half. The fork with help separate out the spaghetti.
Place the spaghetti in a large bowl, Add the vegetables, onion powder and rosemary.
Add the canned diced tomatoes and mix all ingredients together.
Move the mixture into a lightly greased casserole dish.
Sprinkle the mozzarella cheese on top on the mixture, then bake for 25-30 minutes, uncovered.
Remove from oven and let cool for 5-10 minutes.
Serve yourself a plate and enjoy!!
Recipe by LeanMeanKitchen at https://leanmeankitchen.com/veggie-spaghetti-squash-casserole/