Heat 1 Tbsp oil in a large skillet over medium heat. Add onion and cook for approximately 2 minutes.
Add in bell peppers and garlic and cook for an additional 3-4 minutes, or until veggies are crisp-tender. Remove from pan and set aside.
Add the remaining oil to the pan, then add in chicken and season with sea salt and pepper to taste.
Cook for 8 minutes or so, stirring occasionally until browned and cooked through.
Meanwhile, in a small glass bowl whisk together all the sauce ingredients.
Return veggies and add the sauce to the pan and cook, stirring for 2 more minutes until heated through and the sauce thickens a bit.
Garnish with sesame seeds and green onions. I served this over brown rice, but quinoa would also be awesome!