Wiktionary
nice as pie
a. (context simile colloquial English) Very nice.
Usage examples of "nice as pie".
Elsie said she was nice as pie at the Suds of Fun the other night when they were both short of quarters for the dryers.
It turned out they were nice as pie and at the wake afterwards they sat out the back of the pub and drank four lemonades and ate three chops each.
What we're going to do is take the MLTV up fifty feet, twice around the block, and back home again, just as nice as pie.
Be nice as pie with them, pretend to be worried sick about me, but don't give them a clue.
What he does, he comes smiling up, nice as pie, gets close enough and kicks a man's kneecap off, then settles down to stomping him good.