Easy Ground Turkey Lo Mein

Name: Easy Ground Turkey Lo Mein
Ingredients: 1 (8 ounce) package dried lo mein noodles; 4 teaspoons toasted sesame oil, divided; 1 pound lean ground turkey; 1 cup diced onion; 1.5 tablespoons minced garlic; 1 (15 ounce) can low-sodium chicken broth; 1 (8 ounce) can water chestnuts, drained and sliced; 0.25 cup low-sodium soy sauce; 1 envelope onion soup mix; 3 cups chopped celery, 1/4-inch pieces; 1 cup sugar snap peas; 0.25 cup diced red bell pepper; 1 (12 ounce) package fresh mung bean sprouts; 1 pinch red pepper flakes