No-Bake Nutella® Oatmeal Cookies
Do not substitute margarine for butter.
You can substitute smooth peanut butter for Nutella(R).
They will cool very fast which is why, in order to scoop easily, they need to be kept on the warm burner, otherwise the last of the "dough" will be hardened before you can scoop them.
No need to refrigerate, if you do they lose that no-bake "shine."