Add flour, baking powder and nuts. Stir well adding a bit more flour if needed to make a sticky but workable dough.
Form dough into a long log about ¾ inches high and 2 ½ - 3 inches wide and 15 inches long. Brush top with beaten egg white.
Bake in preheated oven 350F for 30-35 min.
Remove from oven and after a couple of minutes, lift log off pan to cutting board. Cut into bars about ½ inch thick.
Place bars cut side up on cookie sheet and return to oven. Bake for 15 - 20 minutes longer.
Cool completely and store in an airtight container.
Biscotti Variations - Different Ingredients You Can Add
The following Pecan Biscotti recipe obviously calls for pecans, but, feel free to substitute other nuts. Almonds or hazelnuts may make a more authentic Italian biscotti but pecans are what I normally have on hand and they taste great too! Also, try;
Chocolate chips, white, milk or dark
Dried chopped fruit
Orange or lemon zest
Different nuts such as hazelnuts and pistachios
I have used all white flour and also used half whole wheat and half white flour.