Spicy Stir Fried Chicken and Greens with Peanuts

Name: Spicy Stir Fried Chicken and Greens with Peanuts
Ingredients: 2 tablespoons soy sauce, divided; 2 tablespoons dry Sherry, divided; 3 teaspoons Asian sesame oil, divided; 2 teaspoons golden brown sugar, divided; 1 1/4 pounds skinless boneless chicken breast halves, cut crosswise into 1/3-inch-wide strips; 3 tablespoons peanut oil, divided; 4 green onions, white parts and green parts chopped separately; 2 teaspoons chopped seeded serrano chiles; 1 large bunch greens (such as spinach, mustard greens, kale, or broccoli rabe; about 1 pound), thick stems removed, spinach left whole, other greens cut into 1-inch strips (about 10 cups packed); 1 /4 cup chopped roasted salted peanuts