In a mixing bowl, combine the soy sauce, sesame oil, and minced garlic.
Add the shredded cooked chicken to the bowl and toss until evenly coated; cover and refrigerate at least 1 hour.
Slightly soften the cream cheese if needed and spread it in a fairly thin, even layer on a large serving plate.
Spoon the sweet-and-sour sauce over the cream cheese layer, spreading gently to cover.
Top the sauce with the chopped baby spinach, then evenly scatter the chilled, sauced chicken over the spinach.
Sprinkle the thinly sliced green onions and chopped salted peanuts over the top.
Cover and refrigerate the assembled dip at least 2 hours before serving.
Serve chilled with sesame rice crackers.