If you are using a pasteurized mix, no ingredients other than flavorings, colorings, or items such as nuts or fruits can be added to the mix.
(you; are using; a pasteurized mix) (no ingredients other than flavorings, colorings, or items such as nuts or fruits; can be added; to the mix)
you no ingredients other than flavorings, colorings, or items such as nuts or fruits
are using can be added
a pasteurized mix
to the mix