Preheat the oven to 200°C (400°F). Line a baking sheet with parchment paper.
Slice the sweet potatoes into ½-inch (1.25 cm) rounds. Aim for consistency so they cook evenly.
Brush both sides with olive oil and season with salt and pepper.
Roast for 20–25 minutes, flipping halfway. They should be golden, tender, and just starting to crisp at the edges.
Add brie slices to each round. Return to the oven for 2–3 minutes just until melty, not bubbling.
Top with cranberries, sprinkle toasted walnuts, drizzle honey, and finish with fresh thyme if using.
Serve warm on a platter. Watch them vanish.
