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• Peel the garlic and potatoes. Wash and separate the spinach leaves. Wash the potatoes and cut them into slices (not too fine), and grate the cheese coarsely. 
• Assembling the casserole: alternate layers of potatoes, spinach and grated cheese in the baking tray or buttered casserole dish, up to half of its height. Heat the oven to 180°. In a bowl, blend the crème fraîche with part of the grated cheese, half of the spinach, the garlic and nutmeg, salt and pepper in a blender. Spread this mixture over the layer of potatoes in the casserole dish and bake for 35 minutes. 

Plating: 
Remove the casserole from the oven and place it onto a serving plate with a napkin on top. If using a baking tray, cut using a spatula and serve on a flat plate.