Fill a large pot with water and bring it to a rolling boil. Add the noodles and cook them following the package directions until they are just tender. Drain well and set aside.
In a small mixing bowl, combine soy sauce, rice vinegar, chili paste, sugar, sesame oil, and red pepper flakes. Stir until the sugar dissolves and flavors meld.
Warm the vegetable oil in a wide skillet over medium heat. Toss in the minced garlic and ginger and cook for about 1 to 2 minutes until they release their aroma.
Pour the prepared sauce into the skillet with the garlic and ginger and mix everything evenly.
Add the water to the skillet, allowing the sauce to simmer gently for 2 to 3 minutes until it thickens slightly.
Add the drained noodles to the skillet and toss thoroughly to ensure every strand is coated in the vibrant sauce.
When the noodles are heated through and nicely coated, take the skillet off the heat.
Plate the chili garlic noodles and garnish with chopped green onions and a sprinkle of sesame seeds. Serve immediately and enjoy your flavorful meal!