In a large bowl, toss the potato rounds with olive oil, garlic powder, salt, and pepper until they are evenly coated.
Arrange the potato rounds in a single layer on a baking sheet. Bake for 20-25 minutes, flipping halfway through, until golden and crispy.
Remove the potatoes from the oven and sprinkle the shredded cheese and crumbled bacon on top. Return to the oven for an additional 5 minutes, until the cheese is melted.
Garnish and Serve: Remove from the oven and sprinkle with chopped green onions. Serve warm with sour cream on the side if desired.