Cook the noodles: Bring water to a boil in a pot. Add the ramen noodles and cook according to the instructions on the package (usually 3-4 minutes). Drain the noodles and set them aside.
Prepare the broth: In the same pot, add the chicken or vegetable broth. Bring it to a simmer over medium heat. Stir in the soy sauce and sesame oil (if using). Add spinach or other greens and cook for another 1-2 minutes until softened.
Boil the egg: For a soft-boiled egg, place it in boiling water for 7-8 minutes, then cool it under cold water and peel. Slice it in half.
Assemble the ramen: Place the cooked noodles in a bowl. Pour the hot broth with the greens over the noodles. Add the boiled egg, green onions, and any other toppings you like (mushrooms, corn, or nori are great options).
Serve and enjoy: Stir everything together and enjoy your delicious homemade ramen!