Kung Pao Chicken with Bell Peppers

Name: Kung Pao Chicken with Bell Peppers
Ingredients: 1 pound boneless, skinless chicken breast, cut into 1/4-inch-thick slices; 2 teaspoons reduced-sodium soy sauce plus 1 Tbsp., divided; 1 teaspoon dry sherry plus 1 Tbsp., divided; 2 teaspoons cornstarch; 2 teaspoons toasted sesame oil; 2 tablespoons unsalted chicken broth; 2 teaspoons balsamic vinegar; 2 teaspoons chile-garlic sauce (see Tips); 2 tablespoons vegetable oil, divided; 3 slices fresh ginger, peeled and smashed (see Tips); 1 medium red bell pepper, cut into 1-inch squares; 1 medium green bell pepper, cut into 1-inch squares; ¼ teaspoon salt; 2 tablespoons unsalted dry-roasted peanuts