Preheat your oven to 350°F (175°C). Line a baking sheet with parchment paper.
In a large bowl, combine the almond flour, granulated sugar, baking powder, and salt.
In a separate bowl, beat the egg whites until they form stiff peaks.
Gently fold the beaten egg whites and vanilla extract into the dry ingredients until well combined.
Using a spoon or cookie scoop, drop small mounds of the batter onto the prepared baking sheet.
Sprinkle each mound with slivered almonds.
Bake for 12-15 minutes, or until the cookies are lightly golden around the edges.
Allow the cookies to cool completely on a wire rack before serving.
Enjoy your meal!