Cook the ramen noodles according to package instructions until al dente. Drain and set aside.
In a large skillet, heat the vegetable oil over medium-high heat. Add the ground beef, breaking it apart with a wooden spoon, and cook until browned, about 5-7 minutes.
Add the minced garlic, grated ginger, and half of the chopped green onions to the skillet. Sauté for an additional 2-3 minutes until fragrant.
Pour in the beef broth, soy sauce, and miso paste. Stir well to combine and bring the mixture to a simmer.
Add sesame oil and chili paste, if using. Let it simmer for about 5 minutes.
Stir in the fresh spinach or bok choy and cook until wilted, about 1-2 minutes.
In serving bowls, distribute the cooked ramen noodles evenly. Ladle the hot beef broth mixture over the noodles.
Top with the remaining green onions and sliced soft-boiled eggs if desired. Serve immediately.