Melt the chocolate in a bowl over a pan of hot water or using a microwave on the defrost setting.
Stir in the golden syrup
Mix in the rice crispies until all coated. I haven't given you a measurement, just use enough that they are all completely coated in the chocolate mixture
Spoon into cupcake cases, leaving a little dent in the middle if you want to put eggs in there.
Decorate with eggs and sprinkle with sprinkles before leaving to set somewhere cool