Preheat the air fryer. Set it to 390°F (200°C). A hot basket helps the sweet potatoes crisp from the start.
Prep the sweet potatoes. Dice into 3/4-inch cubes. Smaller pieces cook faster and brown better.
Pat them dry with a paper towel to remove moisture.
Cut the chicken. Slice into 1-inch chunks. Keeping pieces even helps everything finish at the same time.
Season generously. In a large bowl, toss sweet potatoes and chicken with olive oil, garlic powder, smoked paprika, cumin, oregano, salt, and pepper. If you like heat, add chili powder.
Make sure every piece is lightly coated.
Stagger the cook (for best texture). Add just the sweet potatoes to the air fryer basket in a single layer. Cook for 8 minutes, shaking halfway. This gives them a head start.
Add the chicken. After 8 minutes, shake the basket, then add the chicken pieces on top.
Keep them in a relatively single layer with a bit of space if possible.
Finish cooking. Air fry another 10–12 minutes, shaking once or twice, until the chicken is cooked through and the sweet potatoes are browned and tender. Chicken should reach an internal temperature of 165°F (74°C).
Taste and finish. Sprinkle with a pinch more salt if needed. Add chopped parsley or cilantro and a quick squeeze of lemon or lime for brightness.
Serve. Enjoy as is, or pair with a simple salad, steamed greens, or warm tortillas.
A dollop of plain yogurt or a drizzle of hot honey is a great finishing touch.