Shepherd's pie #1

1. Preheat the oven to 350°F.
2. In an all-iron skillet, heat the olive oil and saute the beef, onion, carrots, and thyme together.
3. Drain off excess fat. Add peas to mixture and stir.
4. Spread the potatoes on top. Dot with butter or brush with oil. Bakei until the crests of the potatoes are lightly browned, about 20-30 minutes.
5. Note: the skillet should have an iron handle so it can go right in the oven.
6. If not, transfer meat mixture to baking dish before adding potato layer.