Cheesy Bacon Ranch Roasted Potatoes

slices bacon (, cooked and crumbled or chopped it bits)

lbs russet potatoes (, scrubbed and rinsed, diced into 3/4-inch pieces (about 7 cups))

olive oil

sea salt (, more to taste if desired)

freshly ground black pepper

medium or sharp cheddar cheese (, shredded (use 2% if desired))

Light ranch dressing (, recipe follows in notes below)

green onions (, whites discarded, greens chopped)

Cooking spray