1. Preheat oven to 400°F and position rack to the middle. Spray a large baking sheet with cooking spray. Place cut zucchini on a baking sheet and drizzle with olive oil, salt, and pepper. Toss to combine. Arrange zucchini so they are spread out and one cut side is down.
2. Bake for 8 minutes, turn zucchini over, and cook for 8 minutes longer, or until the sides turn golden. Remove zucchini from the oven.
