Preheat the oven to 425°F. Line a baking sheet with parchment paper or foil for easier clean up.
Wash, peel and chop the sweet potatoes into ½-inch cubes. They should be the same size so that they cook evenly. This should give you about 6 cups worth.
Add the chopped sweet potatoes to a large bowl. Drizzle 3 tablespoon olive oil, and sprinkle 1 teaspoon salt, ½ teaspoon ground black pepper, ½ teaspoon paprika, ½ teaspoon garlic powder, ¼ teaspoon ground cumin, and ¼ teaspoon onion powder over the sweet potatoes. Toss the ingredients together evenly.
Spread the seasoned sweet potatoes onto the prepared baking sheet in a single layer. Place in the oven to bake at 425°F for 40 minutes, flipping them halfway through. The sweet potatoes will have crispy edges but still be tender inside when they’re done.