Preheat the air fryer. Set it to 390°F (200°C). A hot basket helps the hash crisp faster.
Prep the sweet potatoes. Peel and dice into even 1/2-inch cubes. Smaller cubes cook faster and crisp better.
Toss with oil and spices. In a large bowl, combine sweet potatoes, onion, and peppers.
Add oil, smoked paprika, garlic powder, onion powder, cumin, chili powder, salt, and pepper. Mix until every piece is coated.
Air fry in a single layer. Add the mixture to the basket in a mostly even layer. Some overlap is fine, but avoid crowding.
Work in batches if needed.
Cook and shake. Air fry for 10 minutes, shake the basket, then continue for another 8–12 minutes. You’re aiming for deep golden edges and fork-tender centers.
Add optional proteins or extras. If using cooked sausage or bacon, toss it in during the last 3–4 minutes to heat through. Mushrooms can go in from the start if you like them browned.
Check doneness. Taste a piece.
Add a pinch of salt or a dash of chili powder if it needs more oomph. If the centers are still firm, cook 3–5 minutes more.
Serve hot. Top with cilantro, green onions, avocado, or a fried egg. A splash of hot sauce ties it all together.