Heat 1 tablespoon of oil in a large skillet over medium-high heat.
Add the sliced chicken and cook until browned and fully cooked, about 5-7 minutes. Remove and set aside.
In the same skillet, heat the remaining oil. Add garlic and ginger, sauté for 1 minute until fragrant.
Add the mixed vegetables and stir-fry for 5-7 minutes until tender-crisp.
In a small bowl, whisk together soy sauce and cornstarch. Pour over the vegetables and stir until the sauce thickens.
Return the chicken to the skillet and toss to combine. Adjust seasoning with salt and pepper as needed.
Serve hot over cooked rice or noodles.