Slice chicken breasts into thin strips and mince garlic. Chop mixed vegetables into bite-sized pieces.

Heat vegetable oil in a large skillet over medium-high heat. Add chicken and stir-fry until golden brown (5-7 minutes). Remove from skillet.

In the same skillet, add minced garlic and mixed vegetables. Stir-fry until tender-crisp (3-4 minutes).

Cook lo mein noodles according to package instructions; drain and set aside.

In a bowl, whisk together soy sauce, sesame oil, cornstarch, and a splash of water. Add cooked noodles and chicken to the skillet with the veggie mixture. Pour sauce over everything and toss until well-coated.

Cook for another minute until heated through and slightly thickened. Serve hot.