Make mashed potatoes. Boil the peeled potatoes for 15 minutes.
Mash potatoes and add butter and cream. Use the mixer to make them smooth. (can have some lumps)
Cook the spinach in boiling water for 3-4 minutes. Squeeze out as much excess water as possible, then chop.
Mix the spinach, potato and chopped garlic, salt and pepper and grated nutmeg in a bowl and mush them all.
Cut pastry into circles.
Arrange the potato & spinach mixture across half of the circle leaving a little edge. Moisten the edge to make it stick better and flip the empty half over the top to close.
Brush with egg yolk. Make small holes so that steam can escape during the cooking.
Cook in the center of the oven for 40 to 45 minutes or until pasties are crisp and golden.
