Chocolate truffle

Ingredients :

1. Sweetened condensed milk - 1 can.
   
2. Butter - 1 tsp
   
3. Cocoa powder - 2 tsp
4. Egg yolk - 1 (optional)
   
5. Chocolate sprinkles - 1 package.

Preparation Method :

• Put the condensed milk, butter, egg yolk and cocoa powder in a pan and mix them all together.
• Let the mixture cook over low heat for about 12 minutes, stirring it constantly until the mixture loosens from the bottom of the pan and it is thick like cream.
• Put the mixture on a greased plate and allow it to cool down completely.
• Roll 1 teaspoon of mixture into small balls.
• Put the chocolate sprinkles in a bowl and roll the small balls in the chocolate sprinkles.