May one recite a bracha while in the presence of ervah? According to Shulchan Aruch, Orach Chaim 75, one may not pray or recite Torah while in the presence of body parts that should be covered. Does this also apply to blessings (on food, etc.)?
Yes, see Aruch Hashulchan OC 75:7 who puts brachas part of the prohibition , but gives a reason why it is mutar (only uncovered hair ) nowadays. See also Mishna Berura 74:16 on making a bracha in mikvah. However,many disagree and hold that ervah still applies in our times concerning hair being uncovered .
I found a range of discussion on evrah and tefila - which gives insight.
Many citations references Biur Halakha 74:
Gemara (Berakhot 24), on aspects of a woman that are also considered evrah: