Crispy Baked Sweet Potato Cubes

These sweet potato cubes roast up with deeply browned, crunchy edges and tender, creamy centers—no soggy, steamed texture. The key is a hot preheated sheet pan, plenty of space between pieces, and a light cornstarch coating that turns into a thin, crisp shell in the oven. Seasoned smoky-savory (paprika, garlic, onion) with an optional pinch of heat, they’re an easy weeknight side that also makes a great bowl base or taco filling.

Total time: 40 minutes

Yield: Serves 2–3

Ingredients

  • 2 large sweet potatoes (about 1.5 lb / 700 g), cut into 3/4-inch (2 cm) cubes (peeled or unpeeled)
  • 2 tbsp cornstarch (or potato starch)
  • 2–3 tbsp neutral oil (avocado/canola) or olive oil
  • 1 tsp kosher salt (plus more to finish)
  • 1 tsp smoked paprika
  • 1/2 tsp garlic powder
  • 1/2 tsp onion powder
  • 1/4 tsp black pepper
  • Pinch cayenne (optional)

Instructions

  1. Place a rimmed sheet pan in the oven and preheat to 450°F / 232°C (or 425°F / 218°C convection). Let the pan heat fully; you want it ripping hot.
  2. Cut sweet potatoes into 3/4-inch (2 cm) cubes as evenly as possible so they finish together.
  3. Rinse the cubes briefly under cool water to remove surface starch, then dry very well with towels (any moisture will steam and soften the edges).
  4. In a large bowl, toss the dry cubes with cornstarch until lightly dusty all over.
  5. Add oil, kosher salt, smoked paprika, garlic powder, onion powder, pepper, and cayenne (if using). Toss until every cube looks evenly coated and lightly glossy.
  6. Carefully remove the hot sheet pan from the oven. Spread the cubes in a single layer with space between pieces (crowding = steaming).
  7. Roast for 15 minutes, then flip with a thin metal spatula (scrape firmly; once browned, they’ll release).
  8. Roast 10–18 minutes more, until edges are deeply browned and crisp and the centers feel creamy when pierced with a knife.
  9. Taste and finish with a pinch of salt while hot. Serve immediately for maximum crunch.

Notes

For best crispness, keep cubes at 3/4-inch and don’t crowd the pan. Cornstarch creates a thin crunchy coating; potato starch works similarly. Convection speeds browning; check early. Leftovers keep 4 days refrigerated—recrisp on a hot sheet pan at 425°F for 8–12 minutes (microwave will soften).