Cut the rolls into cubes. Whisk eggs, yogurt and vanilla sugar together. Drain the apricots on a sieve and cut in half. Mix the bread cubes, apricots and half of the egg-yogurt mixture and place in an ovenproof dish. Spread the poppy seed paste on top with a teaspoon as a flake. Pour the rest of the egg and yogurt mixture over the top. Bake in a preheated oven at 175 ° C for about 30 minutes. Serve lukewarm, sprinkle with powdered sugar shortly beforehand.