Creating Biscoff Lava Cookie Cups is a straightforward process. Follow these simple steps to make your own delicious treats:

1. Preheat Oven: Preheat your oven to 350°F (175°C) and grease a muffin tin with non-stick spray.
2. Mix Cookie Base: In a bowl, combine Biscoff cookie crumbs, melted butter, and granulated sugar. Stir until well mixed.
3. Form Cookie Cups: Press the cookie mixture into the bottom and up the sides of each muffin cup to form a cup shape.
4. Melt Chocolate: In a microwave-safe bowl, melt the chocolate chips in 30-second intervals, stirring in between until smooth.
5. Prepare Filling: In another bowl, whisk together eggs, vanilla extract, flour, and salt until combined. Slowly mix in the melted chocolate.
6. Fill Cookie Cups: Spoon the chocolate mixture into each cookie cup, filling them about 3/4 full. If desired, add a teaspoon of Biscoff spread into the center of each cup for an extra gooey surprise.
7. Bake: Place the muffin tin in the preheated oven and bake for 12-15 minutes, or until the edges are set but the centers are still soft.
8. Cool: Remove the muffin tin from the oven and let it cool for about 5 minutes. This allows the cookie cups to firm up slightly.
9. Remove from Tin: Carefully remove the cookie cups from the muffin tin. A small knife can help loosen them if needed.
10. Serve Warm: Enjoy the cookie cups warm, allowing the molten chocolate to flow out when bitten into.

These steps will guide you in creating these incredible Biscoff Lava Cookie Cups effortlessly.