Quick Chicken Peanut Noodles

Name: Quick Chicken Peanut Noodles
Ingredients: 14 ounce udon noodles (pre-cooked (2 packages)); ¼ cup vegetable oil; 2 teaspoon pepper (or ground peppercorns); 1 teaspoon Sriracha; 2 whole star anise; 4 cloves garlic (chopped); 1 tablespoon ginger (grated); 5 green onions (chopped, white parts separated from green); 1 pound ground chicken; 1 cup chicken broth; ¼ cup soy sauce (low sodium); 2 tablespoon peanut butter (smooth); 1 tablespoon rice vinegar; 1 tablespoon cornstarch (mixed with 1 tbsp water); 1 tablespoon sesame oil