Ruby, I'm not a SAHM, but you should totally consider some quick crock pot meals! You could use just 15-20 min of V's nap time to put them together and then you'd have your Down time AND dinner!
I'm not a sahm, my dh is a sahd for now while he is still on break, then he is a part time sahd while in school, and he cooks dinner when I get home from work.
DH doesn't get home until well after the kids are asleep (baby is asleep at 6:30, H is asleep at 7:30, DH works crazy hours and usually isn't home until 8:30 or 9). So, a lot of times I either cook after the kids are in bed. Otherwise I do my prep work for dinner during the day (if E is in a good mood I can do it while he crawls around, otherwise I do it during nap #2) and throw it together at the last minute. We kind of wing it most nights.