Sift the flour and in the middle is done "well". Add the eggs, sugar, the oil, the butter and vanilla. Baking powder and baking soda, pour in the yogurt. Blended into a soft dough, like yogurt mixed with baking soda and pour a little. It rolled thick crust a finger and cut regzlichni shapes. Arrange in a baking dish greased with oil, as the top is coated with beaten egg yolk and sprinkle with granulated sugar. Bake in a hot oven.