Line a bun/muffin tin with paper cases and set aside.
In a large, microwave-safe bowl, combine the nut butter, vanilla, coconut oil, honey and chocolate and stir together. Microwave on short (5-10 second) blasts, stirring each time until the mixture is smooth and glossy, and the chocolate is fully melted.
Add the cereal, and stir well until it's completely coated.
Spoon the mixture into the paper cases, and refrigerate until required. They are best eaten cold, straight from the fridge (the chocolate mixture begins to liquify again at room temperature).