Heat the oven to 400°F.
Place the oil in a large cast iron skillet and put the skillet in the oven until the oil shimmers and the pan is heated through, about 5 minutes.
Combine the turkey, potatoes, beets, onion, old bay and garlic in a large bowl.
Sprinkle generously with salt and pepper and toss to coat.
Spread in an even layer in the hot skillet and roast in the oven until everything starts to get crispy, about 25 minutes.
Remove from the oven, stir in herbs, and return to the oven to roast until the beets and potatoes are fully cooked and browned, about 25 minutes more.