In a large pot, combine the chicken broth and water. Bring to a simmer over medium heat.
Add the soy sauce, sesame oil, ginger, and garlic to the pot. Stir well to combine.
Once the broth is simmering, add the instant ramen noodles. Cook according to package instructions, usually about 3-4 minutes.
In the last minute of cooking, add the shredded chicken and baby spinach to the pot. Stir until the spinach is wilted and the chicken is heated through.
If using, carefully slice the soft-boiled eggs in half.
Serve the ramen in bowls, topping each with a soft-boiled egg half, sliced green onions, and a sprinkle of sesame seeds.