1. Preheat the oven to 350°F and line a baking sheet with parchment paper.

2. In a large mixing bowl, beat the softened butter and granulated sugar until light and fluffy.

3. Add the egg and almond extract, then mix until smooth and fully combined.

4. In a separate bowl, whisk together the all-purpose flour, baking powder, and salt.

5. Gradually add the dry ingredients to the wet ingredients and mix until a soft dough forms.

6. Scoop the dough into equal portions, roll into balls, and place them on the prepared baking sheet.

7. Gently flatten each dough ball slightly and press sliced almonds onto the tops.

8. Bake for 10 to 12 minutes, until the edges are lightly golden.

9. Let the cookies cool on the pan for 5 minutes, then transfer to a wire rack.

10. Once cooled, dust the tops with powdered sugar and serve.