Put the bananas, apples, and the rest of the ingredients according to the recipe. You can add nuts or berries on top as toppings to your liking. Put the Selex powder and baking powder into a sieve and mix until the powder is not visible. Whip the whites in another bowl and mix the sugar 2 to 3 times at a time to make the meringue. Whip the whites in another bowl and mix the sugar 2 to 3 times at a time to make the meringue. At first, add about a third of the meringue and whisk; add the rest of the dough and lightly mix with a silicone spatula to prevent the meringue from getting stiff. Grease a heated pan with oil and wipe lightly with a kitchen towel, stack the dough high. Add a little water around it. Cover and bake on low heat for 5 minutes. Carefully turn over and cover and cook for another 5 minutes.