What beracha acharona when ikar less than kezayit?

Question

If you have an ikar (main) and tofel (secondary) mixture where the ikar is less than a kizayit but the entire mixture is greater than a kizayit, do you still make a beracha acharona on the ikar?

Or if you eat bread but not enough to bench (say birkat hamazon), but you eat other boreh-nefashot stuff that would require a boreh nefashot, do you say boreh nefashot or nothing at all?

Answer 1

If one eats two items each less than a kezayis, but together are a kezayis or more, the bracha acharona is Borei Nefashos.

Thus, in both the case

1. Ikar is less than kezayis, but together with tafel is kezayis
2. Bread is less than kezayis but together with other food items is kezayis

you make a borei nefashos since although the flour component is less than the shiur kezayis, together, with the non flour component, there is a kezayis in total.

These cases are spelled out in Mishne Berurah 208:48 and 210:1, respectively.