Preheat oven to 375°F:
Set the oven to 375°F (190°C) and allow it to preheat.Cut zucchini into rounds:
Cut the zucchini into even rounds roughly 1/4 inch thick.Season zucchini mixture:
Combine the zucchini slices in a large bowl with olive oil, garlic powder, Italian seasoning, salt, and pepper. Stir until evenly coated.Arrange chicken on zucchini:
Transfer the seasoned zucchini to a greased baking dish. Lay the chicken breasts on top.Top with cheddar cheese:
Distribute the shredded cheddar cheese generously over the chicken and zucchini.Bake until chicken cooked:
Bake for 30-35 minutes until the chicken is fully cooked and the cheese is bubbly and golden.Rest before serving:
Take the dish out of the oven and let it rest for 5 minutes before serving.