General Tso's Chicken

Name: General Tso's Chicken
Prep time: 10 min
Cook time: 20 min
Total time: 30 min
Cuisine: Chinese
Ingredients: 1 pound boneless (skinless chicken breast, cut into bite-size pieces); ¼ cup reduced sodium soy sauce (divided*); ¼ cup cornstarch (divided); 1 large egg white; 1 (1-inch) piece peeled fresh ginger; 2 cloves garlic; 2 medium scallions (whites and greens separated); 1 cup reduced sodium chicken broth; 1 teaspoon sriracha sauce (plus more for serving); 3 tablespoons hoisin*; 1 tablespoon plus 1 teaspoon toasted sesame oil; sesame seeds (for garnish)