Preheat oven to 350 degrees.
Lightly oil a baking dish. Heat the oil in a small skillet over low heat; add onion, garlic, thyme and rosemary; sauté until onion is translucent, about 5 minutes; transfer mixture to a shallow dish or pie plate.
Place bread crumbs in another shallow dish or pie plate. Dip chicken first in onion/herb mixture then in bread crumbs, turning to coat well; transfer to a prepared baking dish and cover with any remaining onion/herb mixture.
Cover baking dish with foil and bake for 20 to 30 minutes or until chicken is cooked through.