Melt the Mars bars and butter together in a pot over a small fire. Stir constantly so the chocolate at the bottom don't burn. Melt until it becomes an even liquid mix.

Remove pot from the fire and pour in rice krispies. Use a sturdy flat ladle to mix the krispies and chocolate together until consistent.

Either flatten the final mixture into a flat pan or separate them into bite-sized blobs to save the trouble of cutting.

Serve warm or chilled. Enjoy! :)