Set oven to 400F. Poke a few holes in the sweet potato using a fork or knife. Place them on a baking tray and bake for 45 minutes, or until the potato is cooked through and can be sliced open.
Add the ingredients for the sauce to a bowl or cup and stir. Set aside.
Set a large wok on medium-high heat. Once hot, spray with avocado oil and add chicken. Let the chicken rest in the wok untouched for about 2 -3 minutes or until sear marks appear. Toss the chicken in the skillet then add the bel pepper and cook for another 2 minutes.
Toss in the broccoli and toss everything together. Reduce the heat of the pan to low, then make a hole in the middle of the skillet. Pour the sauce in the hole and stir immediately to prevent the sauce from getting slimy. You may also need to remove from the wok from the heat completely during this step if it is too hot.
Slice open the sweet potato and flake the flesh with a fork. Evenly divide the stir-fry among the sweet potatoes and garnish with sesame seeds.