In warm water put the yeast dissolved, add sugar, egg yolk, salt, oil and flour with baking powder, knead the dough, put in a glass dish and put in the fridge for 60-90 min. the Risen dough formed on Kavasaki and leave for 10 min. Weave bun with beaten egg and allow to stand for 7-10 minutes. Grease with egg again and sprinkle with sesame seeds, put in oven heated to 150-170*C for 25-30 min.