Preheat the air fryer to 390 degrees.
You want to rinse and peel the sweet potatoes. Then, cut them into ½ inch pieces. Make sure they're all about the same size so they cook evenly.
In a small bowl add the garlic powder, onion powder, paprika, salt and pepper. Set aside.
Transfer the sweet potatoes in a bowl and add the olive oil, and ¾ of the seasoning mix. Toss the sweet potatoes to coat them evenly with the oil and seasonings.
Add the seasoned sweet potatoes to the air fryer basket and spread them in a single layer. Cook the sweet potatoes for 8 minutes.
While the potatoes are cooking slice the smoked sausage into rounds and slice the onion into ½ inch pieces.
Add the smoked sausage and onions into the same bowl you used to toss the potatoes. Add the remaining seasoning.
After 8 minutes add the sausage and onions and cook for another 5-7 minutes or until crispy. Serve hot and enjoy!