Make the Cupcakes:
- Preheat your oven to 350°F (175°C). Line a 12-cup muffin tin with cupcake liners.
- In a medium bowl, whisk together the flour, baking powder, and salt.
- In a large bowl, beat the softened butter, granulated sugar, and brown sugar until light and fluffy.
- Add the eggs, one at a time, mixing well after each addition. Then, add the Biscoff spread and vanilla extract, mixing until smooth.
- Gradually add the flour mixture to the wet ingredients in three parts, alternating with the milk, beginning and ending with the flour mixture. Mix until just combined, being careful not to overmix.
- Divide the batter evenly among the cupcake liners, filling each about 2/3 full.
- Bake for 18–20 minutes, or until a toothpick inserted into the center comes out clean. Allow the cupcakes to cool completely before frosting.
2. Make the Biscoff Buttercream:
- In a large bowl, beat the softened butter and Biscoff spread until creamy.
- Gradually add the powdered sugar, mixing on low speed until fully incorporated.
- Add 2 tablespoons of heavy cream or milk and beat on high speed for 2–3 minutes, until light and fluffy. Add more cream or milk as needed to reach your desired consistency.
3. Frost the Cupcakes:
- Pipe or spread the Biscoff buttercream onto the cooled cupcakes.
- Garnish with crushed Biscoff cookies, if desired. Serve and enjoy!