For an extra layer of flavor, consider adding a splash of rice vinegar or a drizzle of sesame oil after tossing the noodles with the chicken. If you prefer a thicker sauce, you can mix a tablespoon of cornstarch with two tablespoons of water and stir it into the slow cooker during the last 30 minutes of cooking. Feel free to customize the spice level by adding a pinch of red pepper flakes or a dash of your favorite hot sauce. This dish is also delicious with other types of noodles, such as udon or ramen.