Peel the cooked potatoes and slice them thinly. Thoroughly wash the spinach and drain well.
Finely chop the onion and crush the garlic. Heat the olive oil in a skillet over medium heat and sauté the onion for 3-4 minutes, until softened. Add the garlic and stir in the spinach. Cook until the spinach wilts down.
Prepare the sauce: gently heat the plant-based milk in a small saucepan. Season with salt, pepper, and nutmeg. Add the grated plant-based cheese and stir until you have a smooth sauce.
Grease a baking dish with olive oil. Start layering the ingredients: potatoes, spinach mixture, sauce. Repeat until all ingredients are used, finishing with a layer of sauce on top.
Bake in a preheated oven at 350°F (180°C) for 30-35 minutes, or until the top is golden brown and bubbly.
Let the gratin cool for a few minutes before serving, so the slices hold their shape better. Serve with a fresh green salad.
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