Preheat your oven to 350°F (175°C).

Grease and line two 9-inch round cake pans with parchment paper.

In a mixing bowl, whisk together flour, baking powder, baking soda, and salt.

In another bowl, beat the softened butter and sugar using an electric mixer until light and fluffy.

Beat in the eggs one at a time, followed by the vanilla extract.

Add the buttermilk and biscoff spread to the butter mixture, mixing until just combined.

Gradually add the dry ingredients to the wet mixture, mixing until just combined.

Pour the batter evenly into the prepared pans and bake for 30 minutes or until a toothpick inserted in the center comes out clean.