Q. According to the OU web site the heter for baking bread which contains milk is that the milk is nullified. May one eat them with meat?
English muffins are typically eaten after toasting them, does toasting make them pas Yisroel?

A. the OU Consumer feature mentions; Currently, the primary justification to certify dairy English Muffins is that the dairy component is less than one part in 60 which is halachically insignificant (bitul bishishim). Ordinarily, the OU does not certify a product that contains a non-kosher ingredient, even if used in small proportions because, halachically, we are not permitted to intentionally nullify a non-kosher entity. (This is known as bitul issusr lichatchila.) Dairy English Muffins are not comparable because the milk component in of itself is permissible, and when it is mixed in the batter at low levels, the milk does not attain a prohibited status. As such, preparation of dairy English Muffins is justifiable.
Horav Shlomo Miller Shlit’a agrees that the hetter mentioned is reasonable in regards to the relatively lesser prohibition of baking dairy bread. However when dealing with bassar-vechalav prohibitions, he recommends to be more stringent, as the article quoted concurs.

Rabbi A. Bartfeld as revised by Horav Shlomo Miller Shlit”a