Preheat oven to 425 F. Toss fingerling potatoes with olive oil, salt, a generous amount of black pepper, garlic and thyme. Roast cut side down until deeply golden and tender (about 25 minutes)
Transfer Camembert to a small baking dish. Lightly score the top. Bake during the last 10 minutes of the potato roasting, until soft and molten in the center.
To finish and serve, transfer hot potatoes to a platter. Drizzle lightly with honey. Crack open the Camembert and spoon over the potatoes. Finish with a scattering of arugula microgreens, flaky salt, fresh black pepper