Preheat oven to 400°F.
Peel the potatoes and cut off both ends. Cut in half to create a total of 8 rounds. Each round will be about 2 inches tall.
Toss the potatoes in 1 Tablespoon olive oil, 1 teaspoon salt and 1/2 teaspoon pepper.
Heat 1 Tablespoon olive oil in a large cast iron (or oven-safe) skillet over medium-high heat. Add the potatoes and sear on each side for 6-8 minutes, until golden brown.
Add the butter, garlic cloves and thyme and continue heating until the butter is completely melted.
Spoon the melted butter over the potatoes.
Slowly add the chicken broth to the skillet; bring to a boil. Once boiling, remove from heat.
Transfer to preheated oven and bake for 35-40 minutes, until a knife easily slides into the center of the potatoes.
Remove potatoes from the oven. Spoon melted butter over them and garnish with additional thyme, salt and pepper. Add freshly grated Parmesan cheese if desired.