In a large pot, heat the sesame oil over medium heat. Add the minced garlic and grated ginger, stirring for about 1 minute until fragrant.
Add the sliced shiitake mushrooms to the pot and sauté for 3-4 minutes until softened.
Pour in the chicken or vegetable broth, soy sauce, and miso paste, stirring until the miso is fully dissolved. Bring the mixture to a simmer.
Once simmering, add the ramen noodles and cook according to package instructions (usually about 3-4 minutes).
In the last minute of cooking, add the baby spinach and sliced green onions to the pot.
While the noodles are cooking, prepare the soft-boiled eggs. Bring a small pot of water to a boil, gently add the eggs, and boil for 6-7 minutes. Transfer to an ice bath immediately to cool before peeling.
Taste the broth and adjust seasoning if necessary. Turn off the heat once everything is cooked through.
To serve, ladle the ramen into bowls. Cut the soft-boiled eggs in half and place on top. Garnish with nori strips, additional green onions, and a sprinkle of sesame seeds.
Notes
Serve in large, deep bowls with chopsticks and a side of soy sauce.