Par boil the potatoes until fork tender. I microwaved the potatoes until tender. Drain completely.
Heat oil on medium-high flame in a 10" cast iron skillet. Add the potatoes along with chili powder, cumin powder, garlic powder, salt & pepper. Gently mix to evenly distribute the spices on the potatoes.
Cook, stirring occasionally until the potatoes are golden brown and crisp all over, should take about 15~10 minutes.