Preheat your oven to 350°F (175°C). Grease a 9-inch round cake pan with butter or cooking spray. You can also line the bottom with parchment paper for easier cake removal later.

In a large mixing bowl, combine the softened butter and almond paste. Use a hand mixer or stand mixer to cream them together until the mixture becomes light and fluffy.

Gradually add the granulated sugar to the creamed butter and almond paste mixture. Continue mixing until smooth. Then, one at a time, add the eggs, mixing well after each addition. Add the vanilla extract and mix again.

Sift the all-purpose flour into the wet ingredients and gently fold it in with a spatula or mixer on low speed until the batter is smooth and well combined.

Pour the batter into the prepared cake pan and spread it out evenly.

Sprinkle the sliced almonds evenly over the top of the batter. This will add a nice texture and flavor to the cake as it bakes.

Place the cake in the preheated oven and bake for 30-35 minutes, or until a toothpick inserted into the center comes out clean.

Once done, remove from the oven and allow the cake to cool in the pan for 10 minutes before transferring it to a cooling rack to cool completely.