For the dough mix the flour and baking powder and sift. Knead in the butter, egg whites, salt and water. Allow to cool. Mushrooms are washed in running water or just deleted a rough clean cloth. If the wash is dry carefully and thoroughly. Cut into small pieces or crushed in large pieces. If not washed improperly, do not pay (much) juice. As mushrooms are added spices confused very well. Parsley and dill dropped in after washing or absorbed onto cloth. Finally, put the feta cheese and confused. Allow to stand for, whether at room temperature or in a cool, there are different views. If you will be prepared much later is better refrigerator. However, room temperature is more intense flavor. Heat the oven to 170 C (fan 150-160). Roll out the dough thinly. Cut out circles or squares, filled with a spoon and close of crescents or triangles. Arrange on a tray with baking paper and bake about 25 minutes. The larger are pretzels, the lower is the temperature and longer time. After subtraction can, still warm, to rub with cut garlic clove. Served with tomato salad or salad of red peppers.