Preheat the oven to 350 degrees Fahrenheit. Line a baking sheet with parchment paper.
Spread the almonds out on a large baking sheet and bake for 10-15 minutes, stirring a couple times, until they are fragrant and a slightly darker brown. Remove from the oven and set them aside to cool slightly. 1 cup almonds
Add the almonds to a food processor, or chop them coarsely with a knife.
Add the flour, baking powder, cinnamon, and salt to a large bowl and whisk them together. Set the bowl aside. 2 1/2 cups all purpose flour, 1 1/2 tsp baking powder, 1/2 tsp ground cinnamon, 1/4 tsp salt
Add the sugar and butter to a bowl and mix together with an electric mixer (or a stand mixer) until combined. 1 cup granulated sugar, 1/2 cup unsalted butter
Add in the eggs, vanilla extract, and almond extract. 3 large eggs, 1 1/2 tsp almond extract, 1 tsp vanilla extract
Add the dry ingredients into the wet ingredients, and mix on low speed until combined. Scrape down the sides of the bowl as needed. Stir in the chopped almonds.
Transfer the dough to a lightly floured surface and knead a couple times to bring it all together into a ball.
If the dough is extra sticky, work in 1 extra TBS of flour at a time. It should be soft, but not overly sticky.
Divide the dough into two equal portions, and place them onto the baking sheet. Using lightly floured hands form them into logs, until each is about 1 inch thick, and about 3 inches x 9-10 inches. Make sure each log is at least 4 inches apart from each other, as they will spread when baking.
Bake until the tops are golden brown, about 25 to 30 minutes, flipping the pan half way through.
Remove from the oven (keep the oven on) and let the biscotti cool for about 10 minutes.
Using a serrated knife, slice the biscotti at an angle into 3/4 to 1 inch thick slices. Place the slices cut side up on the baking sheet.
Bake again for about 10 minutes. Then flip them all over and bake again for another 8 to 10 minutes, until the cookies are golden and dry in the center. They will keep crisping as they cool.
Transfer the biscotti to a wire rack and let them cool completely.