Mix 100 ml milk, sugar and pudding powder. Boil 300 ml milk. Stir in the pudding powder and simmer for at least 1 minute while stirring. Pour into a bowl, place foil directly on the pudding. Cool down for 20-30 minutes.
Line baking tray with baking paper. Let 1 roll of dough rest for about 10 minutes at room temperature. Then unroll and cut in half lengthwise. Cut each half into 3 squares and place on the baking tray.
Separate the egg. Whisk egg whites. Brush corners of squares with it. Fold the corners towards the middle and press down lightly.
Mix the pudding with a whisk. Place 1 strip of pudding in the middle of each piece of dough and 1 tsp. jam on each side. Whisk the egg yolk and cream. Spread the dough pieces with it.
Bake in the preheated oven (electric oven: 200 °C/circulating air: 175 °C/gas: level 3) for about 20 minutes.
Process the dough roll in the same way as the 1st, using apricot jam instead of cherry jam. Cool everything down.