Preheat the oven to 400 degrees f.
Place the potatoes on a flat, rimmed baking sheet, and pour in 3/4 cup water.
Cover tightly with foil then bake for about 25-30 minutes or until fork tender. Drain any remaining water.
Drizzle potatoes with oil then toss to coat well and space evenly on the baking sheet.
Place a 2nd baking sheet on top of it, then press it down, until all the potatoes are smashed to about 1/2 inch thick.
Sprinkle with the thyme, and season with sea salt and pepper.
Return to the 400 degree oven and cook, uncovered for an additional 25-30 minutes.