In a non stick pan, melt the peanut butter, honey or syrup and castor sugar. Bring to boil under low heat. Let it simmer for 1-2 minutes until all the sugar dissolved. Turn off the heat, add in the corn flakes, stir until well mixed.
While it is hot, put a teaspoon of corn flakes on the paper cups. Let it rest in the room temperature until it hardens. Store in an airtight container.
Melt the butter and honey in a pan and stir until the mixture is frothy. Add the cornflakes and stir until well combined.
Scoop the cornflakes to the paper cups and let it cool completely before storing tight container. If preferred, you can add in nuts of your choice.