• Preheat oven to 375 degrees F
• In individual ramekins, layer potato slices, cheese, and onion jam.
• Season with salt and pepper and top each gratin with 1 or 2 tablespoons of heavy cream.
• Cover with foil and bake for 30 to 40 minutes, removing the foil halfway through cooking time.
• Remove from oven and top with chopped chives.