Preheat your oven to 375°F.
In a large mixing bowl, combine the sliced zucchinis, cherry tomatoes, corn, black beans, minced garlic, cumin, chili powder, salt, and pepper. Drizzle with olive oil and toss until everything is well coated.
Spread the vegetable mixture evenly in a greased 9x13-inch baking dish.
Sprinkle the shredded cheddar cheese and grated Parmesan cheese evenly over the top of the vegetables.
Bake in the preheated oven for 25-30 minutes, or until the zucchini is tender and the cheese is bubbly and golden.
Remove from the oven and let it cool for a few minutes. Garnish with chopped cilantro before serving.