Heat oven to 375 F. Place the hen in a baking dish that is 2 inches deep. Stuff hen with orange slices, half the garlic and half the herbs. Gently slide the remaining garlic, herbs, salt and pepper underneath the skin around both sides of the hen.
Bake for 30 to 45 minutes, until the internal temperature reaches 160 F. Cover the pan with aluminum foil and allow the hen to rest for 10 to 15 minutes. It will continue to cook as it rests so the internal temperature reaches 165 F. To serve, cut the hen in half, remove the skin, and then cut into quarters.