Preheat the oven to 400°F (200°C). Line a baking sheet with parchment paper.
In a medium bowl, whisk together 2 ½ cups all-purpose flour, 2 teaspoons baking powder, and ½ teaspoon salt. Set aside.
In a large bowl, use a hand mixer to beat 6 tablespoons room-temperature butter and ¾ cup sugar until light and fluffy, about 2–3 minutes.
Add the 3 eggs one at a time, mixing briefly after each until incorporated. Mix in 2 teaspoons vanilla extract and ¼ teaspoon almond extract, scraping down the bowl as needed.
With the mixer on low speed, add the flour mixture to the butter mixture in batches (about ¼ cup at a time), mixing just until combined and no large streaks of flour remain. Do not overmix.
Fold in ⅔ cup sliced almonds with a spatula until evenly distributed.
Turn the dough out onto a lightly floured surface. Shape it into a rough square, divide it into 4 equal pieces, and roll each piece into a 6-inch long log. Place the logs on the prepared baking sheet, spaced so they are not touching.
Bake at 400°F for 20–25 minutes, until the logs are light golden. Remove from the oven and let the logs cool on the baking sheet for 5 minutes.
Reduce the oven temperature to 325°F. Transfer the logs to a cutting board and, using a serrated knife, cut each log into about 1-inch slices.
Arrange the slices cut-side down on the lined baking sheet, spaced so they are not touching. Return to the oven and bake at 325°F for 15–20 minutes, until the biscotti are dry and very golden.
Remove the biscotti from the oven and cool on a wire rack to room temperature before serving.
Optional: once cooled, you may dip or drizzle the biscotti with chocolate if desired.
Equipment
Oven
Baking Sheet
Parchment Paper
Medium Bowl
Large Bowl
Hand Mixer
Spatula
Serrated Knife
Cutting Board
Wire Rack
Notes
12. Optional: once cooled, you may dip or drizzle the biscotti with chocolate if desired.