Preheat the oven to 350°F. Line a baking sheet with parchment paper.
To make the dough: In the bowl of a stand mixer fitted with the paddle attachment, add the butter, 170 grams of cane sugar, and mix on low until combined and there are no chunks of butter. Add the eggs and mix just slightly, enough to break the yolks.
Add the flour, cocoa powder, malt powder, baking powder, vanilla bean, and sea salt to the butter mixture. Mix on low until a stiff dough forms.
Using your hands form a large log out of the cookie dough and flatten slightly so it’s about 1-inch thick, it should be about 13 x 3 inches. Sprinkle the 2 tablespoons of cane sugar on top of the log.
Bake for 35 minutes or until the middle looks set, but not completely done.
Remove from oven and let rest for 15 to 20 minutes. Trim off the edges, then slice into 12 pieces and separate them.
Bake again for 15 to 20 minutes or until the biscotti is crispy. Allow to cool completely on the baking sheet before serving.
Store in a cool dry place for up to 7 days.