Preheat the oven to 350°F (175°C). Prepare an 8-inch round cake pan by lining the bottom with parchment paper and greasing the sides.
Crumble the almond paste into a food processor, add granulated sugar, and pulse until finely ground. Add softened butter and process until smooth.
Add eggs one at a time, along with almond extract, processing until combined. Scrape down the sides as needed.
Sprinkle in flour, baking powder, and salt. Pulse until just combined and smooth.
Pour the batter into the prepared pan, smooth the surface, and sprinkle sliced almonds on top, followed by granulated sugar.
Bake for 23-26 minutes, or until a toothpick inserted in the center comes out clean. Let cool in the pan for 30 minutes before transferring to a wire rack.
If any almonds fall off, gently press them back onto the warm cake. Dust with powdered sugar or add toppings as desired.
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Notes
Store at room temperature in an airtight container for up to 3 days, or refrigerate for up to a week.