Biscoff cookie bars recipe: For the base Melt: - 150gm butter Whisk in: - 1/2 cup brown sugar - 1/2 cup white sugar - 1 egg - 1 tsp vanilla essence Mix in: - 1 1/2 cups flour - 1 teaspoon baking powder - OR use 1 1/2 cups self raising flour Bake on fan bake for 10-15 min on 180 or until the top is golden. Bake longer if you want a crispy base For the topping Melt together (do this is 30sec increments in the microwave stirring between each until fully melted) - 50gm butter - 100gm white or carame