Preheat a large, deep skillet over high heat with 3 tablespoons of the oil. Season the chicken with some salt and pepper and brown it in 2 batches if necessary. Once the chicken has browned, remove it to a plate and reserve.
Return the skillet to the heat and add the remaining 2 tablespoons oil, the onions, garlic, red bell peppers, broccoli, red pepper flakes, and coriander. Cook, stirring frequently, for 3-4 minutes, or until the veggies start to get tender. Add the orange zest and juice, tamari, and honey; stir, scraping up any brown bits on the bottom of the pan.
Add the chicken stock and bring up to a simmer, then return the browned chicken to the pan and cook for another 5 minutes, or until the chicken is cooked through. Mix the cornstarch with a little splash of water in a small bowl and add to the pan to thicken up the sauce a bit. Add the cashews--as many as you want! Serve the cashew chicken over rice and garnish with the chopped cilantro.