Mix flour and baker’s ammonia or baking powder on pastry board or in a large bowl. Make a well in the center and add all the other dough ingredients. Knead until smooth.
Divide the dough in half and roll out with a rolling pin. Sprinkle the jam and roll the dough creating a shape of a “snake”. Bake on a cookie sheet in preheated oven at 150°C (300 F) for 30 minutes.

Transfer to cooling rack and let cool. Dust with powdered sugar.