Food /
Polish Salted Butter [68]
Edible
I use both...
edible - if you eat it you won't get very sick and/or die but you might not enjoy it
"Those mushrooms taste liks @ss but they're edible."
eatable - depending on context
you can eat it and it's not bad... but not very good either
"The sandwiches in the snack bar are eatble." (but nothing to write home about)
not haute cuisine but... better than expected
"This improvised casserole I made from three days of leftovers is actually quite eatable."
I wouldn't be surprised if eatable originated as a mispronuncation and/or misspelling from edible since in USEnglish the ends of the words are pronounced the same, only the initial vowel is different...
ymmv of course