Pour olive oil into a mixing bowl.
Add potatoes, sweet onion, garlic, salt and pepper.
Toss ingredients to coat.
Line a 11x17” jelly roll pan with parchment paper.
Arrange potato mixture in a single layer on parchment paper-lined 11x17” jellyroll pan.
Bake at 425º for 30-35 minutes or until potatoes are fork tender.
Stir occasionally while baking.
Remove pan from oven.
Transfer potatoes to a large salad bowl.
Toss potatoes with crumbled, cooked, bacon, green onions, Ranch dressing and mayonnaise.
Sprinkle with additional salt and pepper, as desired. (See note below).
Serve immediately, or cover with lid and chill until ready to serve.