2 tablespoons olive oil
1 teaspoon dried thyme
1/2 teaspoon salt
1/8 teaspoon pepper
Preheat oven to 450 degrees. Quarter and cut zucchini into 1 1/2-inch chunks. Thinly slice onion.
On a rimmed baking sheet, toss zucchini and onion with oil, thyme, salt, and pepper. Roast 30 minutes, tossing halfway through.