YOU SAID:
add one egg and mix in potato salad
INTO JAPANESE
卵1個を加えてポテトサラダに混ぜる
BACK INTO ENGLISH
Add 1 egg and mix with potato salad
INTO JAPANESE
卵1個を加えてポテトサラダと混ぜる
BACK INTO ENGLISH
Add 1 egg and mix with potato salad
That didn't even make that much sense in English.