Pour the egg yolks in a medium or large bowl. Then, add the condensed milk and peanuts into the bowl. Mix altogether.
Melt the butter in a medium heat saucepan.
Pour the mixture and stir constantly.
Keep stirring until the mixture have already thickened.
Turn off oven and wait for the yema to cool down.
Use a spoon to scoop a desired amount then use both hands to form them into balls.
Place on a flat dish and insert a toothpick on top of each. Serve.