Step 1

Preheat oven to 375 degrees F.

Step 2

Spray 8 muffin tins with vegetable spray. Layer potato slices, cheese, and onions into each muffin cup. 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. Invert gratins onto plate and serve.