- Add the chicken to a medium sized mixing bowl. Sprinkle the cornstarch evenly out over them. Gently toss with a pair of tongs until the chicken pieces are all well coated. 
- Add the canola oil to a large skillet, or wok, set over medium high heat. Once the oil's hot (it will be shimmery), add the chicken.  
- Cook the chicken, stirring/tossing often, for roughly 6-8 minutes- until the chicken's nicely browned on all sides & cooked through. Using a flat skimmer, remove the chicken to a waiting plate. Set aside. 
- Reduce the heat to medium low, and add the minced garlic and ginger paste to the skillet. Stir them, cooking for 30-45 seconds- just until fragrant. 
- Add the mushrooms & zucchini to the skillet, stirring to combine. Rise the heat back to medium high, and cook them for 3-5 minutes stirring often- until fork tender, but not soggy and they've begun to brown. 
- While the veggies are cooking, whisk together the sauce. Add the soy sauce, vinegar, sugar, and sesame oil to a small bowl and whisk together until evenly incorporated. 
- Once the vegetables are ready, pour the sauce into the skillet. Quickly add the chicken back into the skillet, gently tossing everything to evenly coat and combine. 
- Continue cooking for another minute, just until the sauce has slightly thickened. Remove the dish from heat. 
- Serve the chicken and veggies with steamed white rice, and a sprinkle of sliced green onions & sesame seeds as garnish.