In a saucepan set over high heat, mix the butter, sugar, and milk. Whisk often while they come to a boil.
Boil for five minutes after bringing to a boil, then lower heat to medium.
Whisk in the chocolate chunks until they are melted after taking the liquid off the stove.
Cream together the marshmallow fluff with the vanilla essence.
In a 9×9 baking dish that has been prepared with cooking spray and coated with aluminum foil, transfer the ingredients.
Chill for at least a few hours before serving.
Have fun!
