Peel the russet potatoes and slice them thinly, about 1/8 inch thick. Using a mandoline slicer will make this easier and ensure even cooking. Set sliced potatoes aside in a bowl of cold water to prevent browning.
Heat a large skillet over medium heat with a drizzle of olive oil. Add turkey bacon strips and cook until crispy, turning occasionally. Transfer to paper towel-lined plate to drain excess fat, then crumble into bite-sized pieces.
In a mixing bowl, combine sour cream, shredded cheddar cheese (reserve a small handful for topping), garlic powder, onion powder, salt, and black pepper. Stir well until mixed.
Preheat oven to 375°F (190°C). Drain and pat dry potato slices. Lightly grease baking dish with olive oil. Layer potato slices slightly overlapping, sprinkle crumbled turkey bacon, then spoon sour cream mixture evenly on top. Repeat layers finishing with potatoes. Pour beef broth over top.
Cover dish tightly with aluminum foil and bake for 45 minutes. Remove foil, sprinkle reserved cheddar cheese and chopped green onions on top, then bake uncovered for 15 minutes or until cheese is bubbly and potatoes tender.
Allow potato bake to cool for 5 minutes before serving. Serve with grilled meats or fresh salad for a complete meal.