In a large bowl, combine the sliced zucchinis, uncooked rice, vegetable broth, garlic powder, onion powder, salt, and pepper.
Stir in half of the shredded cheese and half of the Parmesan cheese.
Spread the mixture into a greased baking dish.
Top with the remaining shredded cheese and Parmesan cheese.
Bake for 40-45 minutes, until the rice is cooked and the top is golden and bubbly.