In a large mixing bowl, add water, eggs, oil and Biscoff spread.
Mix until smooth and bubbly.
Add dry cake mix and mix until just combined. Don't over-mix! A few lumps in the batter are completely fine.
Pour batter in cupcake liners.
Bake at 350 degrees F for 16-20 minutes or until an inserted toothpick in the center comes out clean.
Remove from oven and allow to cool to room temperature on a cooling rack.
While the cupcakes are baking and cooling, prepare the cookie butter frosting.
Fill a piping bag with Biscoff spread and attach the long filling tip (Wilton tip 230). Hold the piping bag on top of the cupcake at a 90 degree angle and gently push it through the center, about halfway through. Then, squeeze your piping bag until the center of cupcake starts filling up and gradually pull away.
Fill a piping bag with frosting and attach Wilton Tip 1M (large star tip) and pipe a swirl on top of each cupcake. Enjoy.