Spicy Peanut Butter Chicken Stir Fry

1. Marinate the chicken in garlic powder, salt, pepper, soy sauce, sesame oil and cornstarch for at least 30 minutes while you prep all of the other ingredients. 
2. Mix together the ingredients for the sauce and set aside. 
3. In a large wok or pan over medium high heat, stir fry the chicken in 1 Tbs canola oil until just cooked through and remove from the pan. 
4. Add the remaining 1 Tbs canola oil to the pan and stir fry the garlic, ginger and scallion whites until fragrant (2-3 min); add the onion and stir fry until translucent (2-3 min). 
5. Add the jalapeño, bell pepper, shiitake mushrooms and water chestnuts and stir fry for 4-5 more minutes; add the chicken back in along with the stir fry sauce; cook for 2-3 more minutes or until the sauce thickens and then turn off the heat and mix in the scallion greens. 
6. Taste and adjust seasoning if needed (sometimes I add more salt or chili sauce) - enjoy!