For the dough: Mix well warm water and sugar. Then add the yeast and let it rest (covered) in a warm place for 15 minutes. Mix flour with baking powder and salt. Sift this mix and put it in a bowl. Add the mixture of water, yeast and sugar to the mix of flour, salt and baking powder. Add warm milk and olive oil and mix it well together. Let it rest for an hour, covered, in a warm place.