Pour the egg yolks into a medium or large bowl. Then, add the condensed milk and peanuts into the bowl. Mix altogether.

Melt the butter into a medium heat saucepan.

Pour the mixture and stir constantly. 

Keep stirring until the mixture has already thickened.

Turn off the oven and wait for the yema to cool down.

Use a spoon to scoop the 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.