Toss the chicken in ¼ cup cornstarch, making sure it is coated all over.
Heat 1 tablespoon of the oil in a nonstick sauté pan over medium-high heat. Add the coated chicken and cook for 4 minutes per side. Season with a pinch of salt, then transfer the chicken to a plate and set aside.
Add the remaining oil to the pan. Add all the vegetables and garlic and cook for 5-6 minutes, until tender-crisp.
Return the chicken to the pan and toss with the vegetables.
In a small bowl, mix together the chicken stock, the rest of the cornstarch, honey, soy sauce, and rice vinegar until smooth.
Pour the sauce into the pan and toss over medium heat until the sauce becomes thick and sticky. Serve.