Preheat oven to 400 degrees. Spray a rimmed baking sheet with non-stick cooking spray.
In a large mixing bowl toss potatoes with olive oil, salt and pepper. Spread onto prepared baking dish. Bake in preheated oven 20 minutes, then remove from oven and toss*.
Move potatoes closer to center so there isn't lots of extra space between them, sprinkle evenly with cheddar then return to oven and bake several minutes longer just until cheese has melted.
For the light ranch dressing: In a mixing bowl stir together 1 (5.3 oz) container plain Greek yogurt, 2 Tbsp full fat mayo, 2 Tbsp milk, 1 tsp lemon juice, 1 1/2 tsp dried parsley, 1/4 tsp dried dill, 1/4 tsp onion powder, 1/8 tsp garlic powder, S & P to taste. Or try with my traditional ranch recipe HERE.
*A thin metal spatula works best to flip so you can break the few potatoes that stick away from pan.
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