Wash, peel, and remove the sweet potato skins. Dice into 1-inch pieces.
In a large mixing bowl, add the oil and spices to the sweet potatoes. Toss to coat.
Spray the baking sheet with oil. Place the sweet potatoes in a single layer on the sheet pan. Preheat the oven to 450 degrees F. Place the baking tray in the oven.
Once out of the oven, top with fresh cilantro or green onions and serve as a side dish. Or, as an appetizer, with tortilla chips next to creamy guacamole or pico de gallo.