Add this to the egg and sugar mixture in three equal portions, blending well on slow speed between additions. The dough will be dense, or a little stiff.
Beat the egg white with a fork, and brush the tops of the two logs with it. Sprinkle the logs with the sliced almonds. Press them gently into the egg whites.
Using a good serrated knife, slice each log diagonally into 2 cm (3/4 inch) slices. Use a good back and forth sawing motion, not pushing down into the log. Place the slices on a cut side on the parchment paper.
I was inspired by Patisserie Makes Perfect Hazelnut and Dried Cranberry Biscotti, here. But I did make some adjustments.