Place the butter in a heated saucepan anf allow to melt.
Stir-in the condensed milk and allow to cook for 3 minutes.
Add the egg yolks then continue stirring for 2 minutes.
Set the heat to medium and put-in the chopped peanuts then stir until the mixture becomes thick (about 15 to 20 minutes). Adjust heat to low when texture is about to be achieved.
Turn-off the heat and allow the mixture to cool down.
When the temperature of the mixture is tolerable, scoop a spoonful then roll with your hands to form a sphere (ball shape).
Transfer to a serving dish and apply your desired presentation.
Serve. Share and enjoy!