Preheat the oven to 350°F (175°C) and line a baking sheet with parchment paper.

In a mixing bowl, combine almond flour, sugar, baking powder, and salt.

In another bowl, whisk the egg whites until frothy, then add almond extract.

Gradually fold the egg whites into the dry ingredients until a sticky dough forms.

Using a spoon, scoop small amounts of dough and shape into balls.

Place the balls on the prepared baking sheet, spacing them apart.

Garnish each ball with a few sliced almonds on top.

Bake in the preheated oven for 18-20 minutes, or until lightly golden.

Remove from the oven and let cool on the baking sheet for a few minutes before transferring to a wire rack.