Whisk all sauce ingredients together. Re-whisk just before using at the end.
Heat up a wok with 1 tablespoon of the cooking oil to 400. Check temperature with infrared temperature gun, or heat until oil is shimmering.
Add the chicken to the wok and do not disturb for 30-40 seconds. Stir fry the chicken for another 30-40 seconds.
Remove the chicken from the wok and into a bowl. Set aside.
Clean the wok using tongs and a bunched up wad of paper towels. Heat it up with the remaining 2 tablespoons of oil.
Add in the minced garlic and stir-fry until light brown or aromatic. About 30 seconds.
Add the bell peppers to the wok and do a few quick stirs.
Stir in the noodles.
Re-whisk sauce, and pour down the edges of the wok so it slides down the sides. Do not pour over top.
Continue to stir fry until the noodles are well blended with the sauce and all of the ingredients, and the sauce is thickened, about 1 minute.
Transfer into two serving bowls with tongs.
Top with sauce from wok.
Garnish with the scallions.
Serve immediately.