1. Preheat the oven to 175°C (350°F).

2. Grease a 24 cm (9.5 inch) square baking pan and lightly dust it with flour.

3. In a saucepan, melt the butter over low heat. Remove from heat and let cool slightly.

4. In a large mixing bowl, whisk together the eggs and sugar until well combined.

5. Add the flour to the egg mixture, followed by the cooled butter mixture. Stir until a smooth batter forms.

6. Pour the batter into the prepared baking pan and sprinkle the sliced almonds over the top. Place the pan in the lower part of the oven and bake for 20-25 minutes, or until a toothpick inserted into the center comes out clean.

7. Remove the pan from the oven and let it cool for 5 minutes.

8. Cut the baked mixture into 9 squares, then cut each square diagonally into triangles.

9. Just before serving, dust the triangles with a light coating of powdered sugar.