In a large pot, heat the sesame oil over medium heat. Add the minced garlic and ginger, sautéing until fragrant (about 1 minute).
Add the sliced chicken thighs to the pot and cook until they're no longer pink, about 4-5 minutes.
Pour the chicken broth into the pot and bring it to a gentle simmer.
Stir in soy sauce, sriracha, and chili paste. Adjust the amount of sriracha and chili paste based on your desired spice level.
Add the instant ramen noodles to the pot and cook according to package instructions (usually about 3-4 minutes).
Just before the noodles are done, add the baby spinach and sliced green onions to the broth, letting them wilt slightly.
If using soft-boiled eggs, prepare them by boiling for 6-7 minutes, then cooling them in ice water before peeling.
Divide the ramen and broth into bowls, and top each bowl with a soft-boiled egg, halved. Garnish with a sprinkle of sesame seeds and extra green onions.
Notes
Serve in deep bowls to hold the broth; drizzle extra sriracha for color and heat.