Preheat oven to 400 degrees.
On a parchment lined sheet pan, toss together garlic, fennel, half of the olive oil, salt and pepper; bake for 10 to 15 minutes or until vegetables are slightly tender.
Season chicken with remaining olive oil, salt, pepper and thyme; place on top of vegetables. Reduce oven temperature to 375 degrees. Bake chicken for 20 minutes or until juices run clear.
Remove from oven and serve.