In a large mixing bowl combine the softened butter and sugar. Using a hand mixer, whisk the mixture until light and fluffy.
Next, add the eggs, vanilla extract and keep whisking until you get a smooth consistency.
Next, add the almond flour, all-purpose flour, baking powder and salt. Using a hand mixer, whisk all the ingredients together. Scrub the sides of the bowl using a spatula.
Transfer the cake batter into a springform pan covered with parchment paper. Spread it evenly and decorate the top with the berries of your choice and sliced almonds. You can also sprinkle a little bit of sugar on top for a slightly shiny caramelized look.
Bake the cake at 350°F degrees (180°C) for 50-60 minutes. Check the readiness of the cake with a wooden skewer or toothpick. The skewer inserted into the cake should come out dry. Let it cool completely before serving.