Then, one at a time add in the peanuts, fish sauce, soy sauce, sugar, pepper and chicken, stirring the mixture the entire time.
(one at a time; add; L:in the peanuts, fish sauce, soy sauce, sugar, pepper and chicken, stirring the mixture the entire time; T:Then)
one at a time
add
L:in the peanuts, fish sauce, soy sauce, sugar, pepper and chicken, stirring the mixture the entire time T:Then