Heat the oven to 500 degrees. Coat a rimmed half baking sheet or metal baking dish with cooking spray. Side Note: Don't use a glass baking dish because it may shatter in the oven at such a high temperature.
Peel the potatoes then square off the ends and cut crosswise into 3/4 to 1 inch thick disks.
Toss potatoes with the melted butter, thyme leaves, sea salt, and freshly cracked pepper, to taste. Toss to coat evenly on each potato slice. Place the potatoes in a single layer on the prepared baking sheet/dish.
Roast the potatoes for 15 minutes then flip them over and continue to roast for 15 minutes.
Flip the potatoes once more then add the broth and smashed garlic cloves. Continue to roast for 12-15 minutes, or until tender.
Remove from the oven and place on a serving plate then drizzle with the remaining sauce and garlic cloves. Serve immediately. Enjoy!