Preheat the oven to 375°F, or 190°C.
Mix evenly all the sugar, baking powder, salt, and flour. It’s even better if you take the time to sift all of them into the bowl. Cut up the butter into smaller cubes. Mix in the orange peels and the butter.
With your finger, work thru the butter and mix it with the dry ingredients as best you can.
Stir the milk and one egg, plus the yolk of the second egg (keep the whites, you will need them at the final step) until it’s evenly whisked, and add the mixture to the bowl of other ingredients.
Work them together swiftly, and transfer them to any clean, flat surface in your kitchen.
Now it’s time to add the dried and candied fruits. Work it together, but try to be fast.
To make the bisconies soft, avoid overworking the dough. Flatten the dough with your hands on the flat surface. Skip the rolling pin. You can either cut the rolled-out, flattened dough into squares, triangles, or circles with a cookie cutter.
Put the raw bisconies on a baking sheet lined with parchment paper, and brush them with the gently whisked egg white.
Bake them for 16-20 minutes in the preheated oven. Take one or two hours and let them cool down completely before serving or eating.