In a large pot, heat the olive oil over medium heat. Once hot, add the green onions and sauté for about 2 minutes, or until they start to soften.
Add the shiitake mushrooms and kale to the pot. Stir well and cook for another 3-4 minutes until the mushrooms are tender and the kale has wilted down.
Sprinkle in the ginger powder, kosher salt, black pepper, and chili garlic sauce. Stir everything together, allowing the spices to coat the vegetables.
Pour in the vegetable stock and bring the mixture to a gentle boil. Allow it to simmer for about 5 minutes.
Add the ramen noodles to the pot and cook according to the package instructions, usually around 3-4 minutes. Stir occasionally to prevent sticking.
Once the noodles are cooked, taste the broth and adjust the seasoning if necessary. Ladle the ramen into bowls, and top with extra green onions and a drizzle of sriracha if desired.