Preheat your oven to 350°F (175°C). Line a baking sheet with parchment paper.
In a large mixing bowl, whisk together almond flour, sugar, cocoa powder, baking powder, and salt.
In another bowl, beat the eggs and vanilla extract together. Add the wet ingredients to the dry ingredients and mix until combined.
Fold in the chopped almonds.
Shape the dough into a log about 12 inches long and 3 inches wide. Place it on the prepared baking sheet.
Bake for 25-30 minutes, or until the log is firm to the touch. Remove from the oven and let cool for 10 minutes.
Reduce the oven temperature to 300°F (150°C). Slice the log into ½-inch thick slices and place them cut side down on the baking sheet.
Bake for another 15-20 minutes, or until the biscotti are dry and crisp. Let cool completely before serving.