Delicious Mazurka

Preheat the oven to 350°F (175°C) and grease a baking pan with butter, setting aside.

Cream together the 400 g butter and 400 g confectioner's sugar in a large bowl until light and fluffy, approximately 3-4 minutes of beating.

Add the 12 eggs one at a time to the butter mixture, beating well after each addition to incorporate fully.

Stir in the vanilla extract until evenly combined throughout the batter.

Gently fold the 1½ cups flour into the mixture using a spatula, being careful not to deflate the batter.

Fold the 2 cups of blanched, finely chopped almonds into the batter until evenly distributed.

Pour the batter into the prepared baking pan, smoothing the top with a spatula for even baking.

Bake in the preheated oven for 35 minutes, or until a toothpick inserted in the center comes out clean and the top is golden brown.

Remove from the oven and allow the mazurka to cool in the pan for 10 minutes before turning out onto a wire rack.

Cool completely before serving or storing in an airtight container.