Preheat oven to 200 ° C. Wash potatoes and wrap each with a little butter and salt in aluminum foil. Cook in oven until tender - about 1 hour.
Boil eggs soft core. Chop onion and garlic finely and sauté in butter. Add spinach and season with salt and pepper. Wilt spinach, pour in cream and simmer some minutes.
Peel the eggs, chop coarsely and fold into the spinach. Take potatoes out of oven, cut lengthwise and press lightly on the ends so that opens in the middle.
Fill with spinach-egg.