Preheat your oven to 350°F (175°C).
In a mixing bowl, whisk together the flour, sugar, baking powder, and salt.
In another bowl, beat the eggs and vanilla extract until combined.
Gradually add the wet ingredients to the dry ingredients, mixing until a dough forms. Stir in the chopped almonds.
Divide the dough in half and shape each half into a log about 12 inches long. Place the logs on a baking sheet lined with parchment paper.
Bake for 25-30 minutes, until the logs are golden brown. Remove from the oven and let cool for 10 minutes.
Reduce the oven temperature to 275°F (135°C). Slice the logs diagonally into ½-inch thick slices. Place the slices back on the baking sheet, cut side down.
Bake for another 10-15 minutes, until the biscotti are dry and crisp. Let cool completely before serving.