Boil water in a pot. Add ramen noodles and cook according to package directions, typically 2-3 minutes. While noodles cook, prepare the egg as desired (e.g., soft-boil for 6-7 minutes, then peel and halve). Drain the noodles well and set aside. In a separate medium pan, melt the butter over medium heat. Pour in the heavy whipping cream and bring to a gentle simmer, stirring occasionally. Add the shredded cheese, stirring continuously until it completely melts and the sauce becomes smooth and creamy. Season with a pinch of salt and black pepper to taste. Add the drained ramen noodles to the creamy cheese sauce, tossing gently with tongs to coat them evenly. Ensure all noodles are well-covered. Transfer the creamy ramen to a serving bowl. Top with the halved egg, chopped green onions, and a sprinkle of chili flakes if desired. Serve immediately and enjoy your elevated ramen!