Start by preheating the oven at 350°F (180°C). Cover baking tray with parchment paper.
First you will beat two large eggs and the sugar. Next you’ll add the vanilla. If you are using other extracts, such as almond extract, mix them in now. This is also when you will want to add citrus zest such as orange or lemon zest.
In another bowl, whisk together the flour, baking powder and salt. Add the dry ingredients to the wet and mix until combined.
Finally, stir in any mix-ins the almonds in this case, or any other ingredients you want to use.
For this quantity you can shape the dough into a log shape (see notes). Place the logs on a parchment-lined baking sheet. Press down with your hands to flatten the logs, you want them to be 3/4-inch thick to ensure even cooking. You can also use your hands to smooth and flatten the edges of the dough logs.
Position oven rack in the middle of the oven and bake the dough logs for 20-25 minutes at 350 degrees, until they are lightly golden. The center will be slightly soft (see notes). At this point lower the oven temperature to to 325°F (175°C).
Place the cooked log on a cutting board. Slice the logs on the diagonal, pressing a sharp knife straight down into the dough (see notes).
Place the cookies back on the baking tray, cut side up. Bake the biscotti a second time, for 12-16 minutes, until golden brown and crisp.
Your cookies are now ready!