MAKE THE SAUCE: In a small bowl, whisk together all the ingredients for the sauce.
Heat cooking oil in a large skillet on medium-high heat. Add chicken and cook until brown, about 3-4 minutes. Pour in the remainder of the sauce and turn the heat to high. Allow sauce to bubble and thicken while stirring - about 1-2 minutes - add water as needed to thin out sauce as desired. Season to taste with salt, black pepper and/or red chili flakes.
Add zucchini noodles into the pan and use tongs to toss and coat with sauce. Cook for 1-2 minutes until zucchini is just tender but still firm. Be careful not to overcook.
*do not overcook for longer than 2 minutes or else noodles will get too soft and mushy. You can also serve the chicken over raw zucchini noodles if desired.