In a large bowl, toss chicken with rice vinegar, green onions, ginger, soy sauce, 1/2 teaspoon salt and 1/4 teaspoon pepper.
Chill 30 minutes to 8 hours.
Drain chicken well; discard marinade.
Dip chicken in bread crumbs; chake of excess.
Heat 2 tablespoons oil in a nonstick skillet over medium-low heat. Cook 1/3 to 1/2 of the chicken without crowding until no longer pink in center, about 2 minutes per side; drain on paper towels.