This is a fantastic basic recipe for traditional, crumbly Jam Slippers! The combination of fat, egg yolk and yeast gives that wonderful, soft, but still slightly layered texture.

Based on the ingredients provided, I will put together the complete recipe for you and the missing steps!

🥿 Jam Slippers (Shortbread, Fatty Dough)
I. Ingredients (from 1 kg of flour)
Ingredient Quantity Function
Flour (fine flour) $1\ \text{kg}$ Dough base
Fat (lard or butter/margarine) $24\ \text{dkg}$ For the crumbly texture
Egg yolks $2\ \text{pcs}$ Color, flavor and softness
Salt $2\ \text{beaten tbsp}$ Flavor enhancer

Yeast $5\ \text{dkg}$ Leavening agent
Warm milk $2\ \text{dl}$ For the yeast to work and the dough to form
Sugar (for yeast) $1\ \text{small spoon}$ Activates the yeast
Jam (plum or peach) For decoration and filling
Icing sugar For decoration
II. Preparation

Activating the Yeast:
Add the small spoon of sugar to the lukewarm milk.
Crumble the $5\ \text{dkg}$ yeast and let it rise in a warm place for $5-10$ minutes until the top is foamy.
Kneading the Dough:
In a large bowl, put the flour, salt, egg yolks and fat.
Pour in the activated yeast.
Start kneading/kneading the dough. If necessary, add a little more lukewarm milk until you get a medium-hard, elastic dough. Due to the fat content, it should not be too soft!
Knead thoroughly until the dough separates from the sides of the bowl.
Proving:

Cover the bowl with a kitchen towel and put in a warm place.
Let the dough rise for $40-60$ minutes, until it has at least doubled in volume.
Shaping and Filling:
Turn the risen dough out onto a floured board. Divide into two or three pieces.
Roll out the dough to about $3-4\ \text{mm}$ thickness.
Cut into squares (about $8 \times 8\ \text{cm}$).
Place a small spoonful of filling in the center of each square (thick plum or apricot jam works best).
Fold the two opposite corners of the square into the center over the jam, pressing the edges together slightly to prevent them from opening during baking.
Baking:

Arrange the slippers on a baking sheet lined with baking paper.
Bake in a preheated oven at $180\ ^\circ\text{C}$ until golden brown, which will take about $15-20$ minutes.
Finishing:
Sprinkle the slippers generously with powdered sugar while they are still warm (but not hot).
Happy baking and bon appetit!