Preheat the oven to 400°F. Prepare a half-sheet with parchment paper and set aside.
Combine the chicken, zucchini, sweet potatoes, onion, garlic and thyme on the baking sheet.
Pour the olive oil over the ingredient and gently toss together. Season with salt and pepper and toss again.
Place the sheet pan with the ingredients in the oven and bake for 25-30 minutes.