Beat the egg whites to hard snow and carefully add them to the mix. Last, add the pitted cherries (and morelos) that are rolled in the crushed biscuits.
Stir with a wooden spoon, being careful not to drop the dough. Pour the prepared mixture into a pre-greased baking tin, the bottom of which is covered with baking paper.
Put to bake in a preheated 356°F (180 °C) oven for about 35-40 minutes. Allow to cool and then sprinkle with powdered sugar and cut it.