Butter a dish or shallow bowl and set aside.

In a medium, heavy bottomed sauce pan, mix the sweetened condensed milk, cocoa, and butter.

Over medium to medium-low heat, stir mixture continuously to cook evenly and prevent the bottom from burning.

Cook until mixture is lightly bubbling, is noticeably thickened, and stir passes expose the bottom of the pan.

Cook and stir for a minute more.

Remove from heat.

Immediately pour into the prepared dish or bowl.

Allow to fully cool.

Butter hands and roll into small balls.

Roll formed balls into chocolate sprinkles to thoroughly coat.

Place in paper candy cups for storage and serving.