Heat the vegetable oil in a large pot over medium heat.
Add the minced garlic and ginger, sautéing for about 1-2 minutes until fragrant.
Stir in the chicken thighs, browning them on all sides for about 5-6 minutes.
Pour in the chicken broth and bring to a boil.
Lower the heat and let it simmer for 15-20 minutes until the chicken is fully cooked.
Remove the chicken, shred it using two forks, and return it to the pot.
Add the egg noodles and cook according to package instructions (about 5-7 minutes).
In the last few minutes of cooking, stir in the baby spinach, soy sauce, and sesame oil.
Taste and adjust seasoning with salt and pepper before serving.
Serve hot, garnished with additional sesame oil or fresh herbs if desired.