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

In a bowl, whisk together flour, sugar, baking powder, and salt.

In a separate bowl, beat the eggs with vanilla until light and frothy.

Stir the wet ingredients into the dry mixture until you have a sticky dough. Fold in chopped almonds.

Shape dough into a log approximately 12 in (30 cm) long and 3 in (8 cm) wide on the prepared baking sheet.

Bake for 25–30 minutes, until golden and firm to the touch.

Remove from oven and let cool on the baking sheet for 10 minutes.

Using a serrated knife, slice the log diagonally into ½‑inch (1–1.5 cm) thick slices.

Arrange slices cut‑side down on the baking sheet and return to oven for a second bake, 10–12 minutes per side, until crisp and lightly golden.