Finely chop the peanuts.

In a small saucepan, place the egg yolk (use the egg white in another meal), peanut butter, butter, cocoa, sweetener, and a few drops of optional chocolate flavoring. Pour half of the prepared milk into the saucepan.

Add starch to the rest of the milk. Mix thoroughly until smooth (no lumps).

Set the saucepan over medium heat. Heat the contents, constantly stirring with a kitchen whisk or fork. It's important to achieve a smooth and even consistency. When the saucepan's contents start to simmer gently – reduce the heat and start pouring the milk with added starch in a thin stream (stir again just before pouring to ensure nothing is left at the bottom), continuously stirring at a medium pace with a kitchen whisk or spoon. Once all the ingredients are combined, keep stirring and increase the heat to medium. Stir the pudding until it boils and thickens. After a moment, turn off the heat. The pudding should not have any lumps. If lumps appear, try to get rid of them by mixing more thoroughly and crushing with a whisk or spoon.

Transfer the ready pudding to a bowl. Sprinkle with nuts. Enjoy it warm or cold.