Melt 2/3 of the chocolate in a bowl over hot water and coat the moulds with the melted chocolate. You may need to do this more than once to get the desired thickness of chocolate shell.
Place the chopped potato into a saucepan and cover with water. Boil until tender.
Drain and mash.
Add your condensed milk, just as you would add regular milk to normal mashed potatoes.
Allow this mixture to cool.
Mix in your peanut butter and confectioner’s sugar. It should form a fairly thick paste.
Add more condensed milk or confectioner’s sugar if required.
Spoon this mixture into the chocolate lined moulds.
Melt the remaining 1/3 of the chocolate. Use this to seal the mixture into the moulds.
Chill until the chocolate hardens then press your eggs out of the moulds.
Notes
You will also need Easter Egg Moulds. I bought mine from a craft shop for around $4.