Start by scrubbing 1 large sweet potato. Then, slice into circles.
Toss sliced potatoes with olive oil, kosher salt and pepper in a large bowl.
Next, spread potatoes out in a single layer on a baking sheet and roast in 325º oven for 30 - 35 minutes or until starting to brown.
Flip potatoes halfway through baking.
While potatoes are baking, mix together 1 c. real mayo, 2 tsp. sour cream, 1/2 tsp. black pepper and a couple of heaping teaspoons of chili powder. Chill in fridge until potatoes are done. Serve along side of finished sweet potatoes.