Place the tomatoes on paper towels and gently press to absorb some of the liquid.
In a 2½ quart baking dish, combine zucchini, sliced tomatoes, olive oil, Italian seasoning, onion powder, garlic powder, salt, and pepper.
Toss well to coat and spread into an even layer. Cover with foil and bake for 25 minutes.
Remove the foil and top with the mozzarella and parmesan cheese. Bake uncovered an additional 15 minutes or until zucchini is tender. Garnish with fresh basil if using.