Preheat oven to 350 degrees F.
Line a cookie sheet with parchment paper. Set aside
In a large bowl, combine the flour, ground almonds, chocolate chips and baking powder. Stir and set aside.
In a separate bowl, whisk together the eggs, sugar, melted butter, vanilla extract, almond extract and orange zest.
Make a well in the centre of the flour mixture and pour in the egg and sugar mixture.
Stir the mixture with a wooden spoon until well combined and no flour bits are visible.
Scrap the biscotti dough onto a lightly floured work surface and divide into 4 equal portions.
Dust your hands and work surface with flour and roll each portion into a 10-inch log.
Transfer the logs onto the prepared cookie sheet.
Brush each log with the lightly beaten egg white.
Bake in a preheated oven for 25 minutes.
Remove the cookie sheet from the oven and allow the biscotti logs to cool for approximately 15 minutes before slicing.
Once slightly cooled, transfer the logs, one at a time, to a cutting board and slice them into 1-inch pieces.
Transfer the sliced biscotti to the cookie sheet in an upright position.
Place back into the oven and bake an additional 10 to 15 minutes, depending on how dry you want them.
Cool the biscotti completely before storing in an airtight container.