Preheat the oven to 350°F, and line your cupcake pan with liners. Set aside.
Sift together all the dry ingredients and set them aside.
1½ cups All-purpose flour, 1½ teaspoon Baking powder, ½ teaspoon Baking soda, ¼ teaspoon Salt, ¾ cup Biscoff
Heat the biscoff butter in the microwave for 30 sec. until creamy. Add the soft butter and mix.
¼ cup Biscoff butter, ½ cup Butter
Add the sugar to the butter mixture and beat until light and fluffy. About 3 minutes.
¾ cup Sugar
In a separate bowl mix oil, eggs, buttermilk, sour cream, and vanilla extract.
2 Eggs, ¾ cup Buttermilk, ¼ cup Sour cream, ¼ cup Oil, 1 tablespoon Vanilla extract
Start with dry ingredients. Using a rubber spatula, add half the dry ingredients to the butter mixture, then add half the liquid mixture, and repeat until all the ingredients are mixed. DO NOT OVERMIX.
Fill the liners up to ⅔, and bake for 18-20 minutes, or until an insert comes out clean. Let cool in the pan for 10 minutes then transfer to the cooling rack. Let cool completely before frosting.