Combine the chili flakes, salt, sugar, soy sauce, black vinegar, and thai chili peppers in a heat proof bowl.
In a pan, heat up the oil on medium heat. Add the garlic and cook until slightly toasted, about 1 to 2 minutes. Adjust the heat if needed to prevent the garlic from burning.
Pour the garlic oil over the chili mixture and stir well. Set aside for 5 minutes or until cool.
Boil the noodles according to the package instructions. Drain and transfer to a bowl. Add the garlic chili oil and mix well.
Garnish with scallions, cilantro, and sesame seeds.
Serve immediately and enjoy!