Preheat the Oven:
Preheat your oven to 350°F (175°C). Line a 12-cup muffin tin with cupcake liners.
Make the Cupcake Batter:
In a large bowl, cream together ¼ cup unsalted butter and ½ cup Biscoff spread until light and fluffy.
Add 1 cup granulated sugar and mix until combined.
Beat in 2 large eggs, one at a time, followed by 2 teaspoons vanilla extract.
In a separate bowl, whisk together 1 ½ cups all-purpose flour, ½ teaspoon salt, and 1 ¼ teaspoons baking powder.
Gradually add the dry ingredients to the wet ingredients, mixing until just combined.
Add ⅓ cup whole milk and mix until smooth.
Divide the batter evenly among the 12 cupcake liners, filling each about two-thirds full.
Bake the Cupcakes:
Bake in the preheated oven for 17-20 minutes, or until a toothpick inserted into the center of a cupcake comes out clean. Let the cupcakes cool completely on a wire rack.
Make the Biscoff Buttercream:
In a stand mixer, beat ½ cup unsalted butter and ¼ cup Biscoff spread until smooth and creamy.
Gradually add 1 ½ cups powdered sugar, ½ teaspoon salt, 3 tablespoons cream, and 1 teaspoon vanilla extract. Continue to beat until light, fluffy, and well-combined.
Assemble the Cupcakes:
Once the cupcakes have cooled, pipe the Biscoff buttercream onto the cupcakes using a piping bag fitted with a star tip.
Optionally, sprinkle crushed Lotus Biscoff cookies over the frosting for added texture, or top each cupcake with a whole Biscoff cookie.