Slice peppers and onion very thin. Heat oil in skillet on medium, then add peppers & onions to sauté for 3-4 minutes.
Slice sweet potato into 1/4-inch thick pieces and add to skillet along with sliced chicken sausage. Toss a few times, then cover with a lid & let cook for 5 minutes on medium heat.
Add seasonings, stir, then add broccolini to the same skillet and let cook, covered, for an additional 5 minutes.
Once tender, remove from heat. Serve with sliced jalapeño & fresh cilantro.