This lotus biscoff cake is a layer cake made with a soft biscoff cake, biscoff buttercream, filled with biscoff cookie crumbs, and topped with biscoff cookies.
Into a big mixing bowl, add the room temperature butter, powder sugar, vanilla extract, and milk. Mix with an electric hand mixer for a few minutes until the buttercream is light in color and creamy.
Melt the cookie butter in the microwave until it's melted and top the cake with it, use a spatula to carefully push the biscoff butter around the edges of the cake until a drip design forms.