Sift flour, baking powder, baking soda and salt together in a bowl. Stir in egg, yogurt and 2 tablespoons of the butter. Gradually stir in enough milk to make a soft dough. Cover with a damp cloth and place in a warm place for 2 hours. Preheat oven to 400 degrees f (205 c). Knead dough on a floured surface for 2 or 3 minutes until smooth. Divide into 8 pieces roll each piece into a ball then into ovals about 6 inches long.

If you must use a baking sheet, grease it and brush the underside of the bread with water. Brush the other side with butter and sprinkle with poppy seeds. Bake 6 to 10 minutes until puffy and golden brown. (this is where the stone makes a difference)