Add the canola oil to a heavy skillet on medium-high heat.
Add the chicken and cook 5-7 minutes on each side, or until cooked through.
Remove from the pan and add in the canola oil, garlic, ginger, red chili peppers, green bell peppers and green onions.
Cook for 1 minute, stirring frequently.
Add in the water, soy sauce, cornstarch and brown sugar and let the sauce thicken on medium heat.
Cut the chicken breasts into thin slices and add it into the pan along with the peanuts.
Toss together with the sauce and serve.