01 - Bring a large pot of water to a rolling boil. Divide the boiling water into several heatproof bowls corresponding to the number of colors intended for use.
02 - Stir a small amount of gel-based food coloring into each bowl, mixing thoroughly to achieve vibrant hues.
03 - Separate dried noodles into equal portions and cook each batch in its colored boiling water for 2 to 3 minutes less than the package instructions. This keeps the noodles al dente for final cooking. Drain and rinse under cold water to halt further cooking, then set aside.
04 - Melt unsalted butter in a saucepan over medium heat. Add cream cheese and gently stir until fully blended and smooth.
05 - Add whole milk, grated parmesan cheese, cornstarch, salt, and white pepper to the pan. Whisk continuously over medium heat until the mixture thickens and attains a smooth, creamy consistency, about 5 minutes.
06 - Gently fold colored noodles into the sauce, taking care to keep colors distinct, or swirl lightly for a marbled effect.
07 - Serve immediately, topping each plate with sliced scallions, toasted sesame seeds, and edible flowers or microgreens as desired.