Preheat the oven to 425 degrees. Line a baking tray with foil for easy cleanup and set aside.
Peel and cube the purple sweet potatoes into equal sized pieces, about 1-2” in size. Place the cubed potatoes in a large bowl. Sprinkle with the cumin, turmeric, chili powder and salt. Drizzle on the olive oil and stir to coat each piece of potato evenly.
Spread the potatoes in an even layer on the baking tray and place in the oven for about 20-25 minutes, turning them at the halfway point to ensure even cooking. (test at min. 20 to see if fork tender, smaller will take less time)
Remove, drizzle with a bit more olive oil, garnish with fresh chopped parsley and flaked sea salt.