Preheat oven to 400 degrees.

Slice each sweet potato in half lengthwise, and slice each half crosswise into 1-inch-thick half-moons.

Melt butter in a large cast-iron or other ovenproof skillet over medium heat. Add sweet potatoes; toss to coat evenly.

Add Vanilla Bean Syrup and toss potatoes to coat. Bring to a boil.

Transfer skillet to oven. Cook, stirring occasionally, until potatoes are golden, well glazed, and tender when pierced with a paring knife, about 20 minutes.

Remove from oven, and season with salt and pepper. Serve warm, garnished with thyme.