Heat a large skillet to medium heat while also bringing a large pot of water to boil.

When the skillet is hot, add one tablespoon of olive oil.

Add cubed chicken and cook 3-6 minutes turning as needed, then remove from pan when the chicken is brown.

When the pot of water begins to boil, cook noodles according to package directions.

Meanwhile, mix the soy sauce, vinegar, brown sugar, sesame oil, garlic, and ginger together in a small measuring cup or bowl. Stir until mixture is smooth, then set aside.

When noodles are tender, drain and rinse with warm water.

Place back into pot along with the cooked chicken, then drizzle sauce over noodles.

Toss mixture so that everything is evenly coated with sauce.

Top with sesame seeds and red pepper flakes if desired.