I say "ee-vee per see-squared" or "ee-vee over see-squared."
If it's convenient to assume $c=1$, I'll say "ee-vee" or "electron volts." I can't remember ever having said "electron volts over see-squared."
For MeV and GeV I'll say "em ee vee" or "gee ee vee." I know people who say "mev" or "jev", to rhyme with the first syllable of "Beverley", but in low-energy nuclear physics they're in a minority.
Tangential to your question, essentially everyone I know (US/Canada bias) says giga as /ˈɡɪɡə/ with two hard G sounds, rather than /ˈdʒɪɡə/ with an initial J sound. This is probably why "jev" grates on me so hard.
When I'm talking about cold neutron reactions I have to be careful to distinguish between milli-ee-vee (meV) and mega-ee-vee (MeV), since both scales occur in the same reaction. Occasionally I'll say "milli electron volts" (or similar), if I especially want to emphasize the energy to the listener.
When I'm talking to someone who's not a physicist, I'll sometimes say "Energy is measured in volts" and then talk about volts, megavolts, etc.