Preheat oven to 425 degrees F. Lightly oil a baking sheet or coat with nonstick spray.
In a small bowl, whisk together olive oil, cumin, paprika, chili powder, cinnamon, 1 1/4 teaspoons salt and 1/2 teaspoon pepper.
Place sweet potatoes in a single layer onto the prepared baking sheet. Stir in olive oil mixture and gently toss to combine.
Place into oven and bake for 30-35 minutes, or until fork tender, stirring halfway. Sprinkle with cilantro.
Serve immediately with lime wedges.
Notes
Use a good quality sheet pan. A durable sheet pan is ideal – it will last for years with minimal wear and tear, and will help achieve even cooking and avoid warping at high temperatures.
Use firm potatoes. When purchasing sweet potatoes, look for small to medium evenly shaped potatoes that are firm with smooth and taut skin.
Leave the skin on. With a good scrub, the skin can be left on the potatoes. The skin is a good source of fiber, adds texture and helps the potatoes stay moist inside.
Cut in uniform size. Chop the potatoes in similar size for even cooking.
Thoroughly coat the potatoes. Toss the chopped potatoes directly on the sheet pan until thoroughly coated with the olive oil spice mixture.
Bake directly on the sheet pan. No need for parchment paper here. Bake the sweet potatoes directly on the sheet pan for caramelization and perfectly crispy skin.
Avoid overcrowding the pan. Spread the potatoes out in a single layer with a little bit of space between them. Overlapped, layered potatoes will steamed instead!