Cook the rice (instructions below).
In a large skillet over medium-high heat, add 1 tablespoon oil, veggies, and ¼ teaspoon salt. Cook until veggies are tender, 3-5 minutes. Transfer the veggies to a bowl. Carefully wipe out any veggie debris from the skillet.
In a small bowl, whisk together the sauce ingredients.
Sprinkle the tapioca starch and remaining ¼ teaspoon salt over the chicken and toss to coat.
Add remaining 1 tablespoon oil to the skillet over medium heat. Add the chicken and spread out into an even layer. Let cook for 3 minutes undisturbed, or until golden brown. Give the chicken a stir/flip them over and cook for 2 more minutes or until cooked through.
Reduce the heat to medium-low and add veggies back to the skillet along with the sauce (give the sauce a stir before pouring in). Give it a stir and let the sauce simmer for about 2-3 minutes, or until it thickens up (it will thicken as it cools as well).
Serve the chicken/veg over rice, making sure to drizzle some of that sauce over top. Top with herbs, nuts or sesame, and sriracha (if desired).