Preheat the oven to 350ºF and line a large baking sheet with parchment paper. In a large bowl, combine the dry ingredients, including the almond flour, coconut sugar, cacao powder (if making the chocolate version), baking powder, and salt. Whisk well to break up any clumps.
Add the remaining wet ingredients to the dry ingredients. Stir in the egg, coconut oil, and extract. Mix until a thick, sticky dough is formed. If you want to add in sliced almonds for texture, now is the time to do it.
Transfer the dough to the prepared baking sheet, and use your hands to press it into a "log" shape, about 8-9 inches long, and around 4 inches wide. You want the loaf to be about 1/2-inch thick. Once it's formed, place it in the oven to bake for 20 minutes, or until the edges are lightly golden.
Turn off the oven, remove the pan, and let the loaf cool completely. I recommend letting it cool at room temperature for 30 minutes, then transfer it to the fridge or freezer for 1 to 2 hours, to cool completely. This will make it easier to slice. Once it's cool, slice the loaf into 1/2-inch pieces, making about 20 to 22 slices.
Preheat the oven to 250ºF for the second bake. (Do not use a higher oven temp!) Carefully arrange the slices in a single layer on the baking sheet, and bake for 30 minutes. Then, remove the pan, flip the slices, and bake for another 30 minutes. Turn off the oven and let the biscotti stay in the oven as it cools. This will help them totally crisp up.
When the biscotti are cool, they should be perfectly crispy and read to serve. Almond flour baked goods will get soft if you store them in an airtight container at room temperature, so I recommend storing these in an open container at room temperature, or in the fridge in an airtight container to keep them crispy. They should last for 3-4 days at room temp, or up to 2 weeks in the fridge.
How to Decorate Them
If you'd like to dip the biscotti in chocolate to make them look fancier, melt 1/2 cup of dark chocolate chips for 1 batch of biscotti. I use a spoon to drizzle chocolate over the top of each biscotti, coating only 1/3 of each piece.
For the chocolate peppermint biscotti, I like to sprinkle some crushed candy cane on top of the chocolate. (I use YumEarth brand.) For the almond biscotti, you can sprinkle crushed almonds on top, or any other nut you like. (Hazelnuts are really nice, too!) Let the chocolate cool completely until hardened, then serve or store as directed above.
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Notes
Nutrition information is based on the Almond biscotti, for 1 of 22 slices. This information is just an estimate, and not a guarantee.Vegan Version: Replace the egg with 2 tablespoons of tapioca or arrowroot starch + 3 tablespoons of water. For the second bake, I recommend leaving them in the oven at 250ºF for 45 minutes on each side, then turn off the oven and let them cool for at least an hour before removing the pan. Sliced Almond Version: If you'd like to add sliced almonds to your biscotti, add 1/4 cup into the batter after it's mixed, but before you form the log. Keep in mind that the added almonds may make it harder to slice, so be sure to use a super-sharp knife!