Copycat Cracker Barrel Hashbrown Casserole

Adjust an oven rack to center position, and preheat to 350ºF. Using a box grater or the grater attachment on your food processor, grate the potatoes and onion. Working in batches, place handfuls of shredded onions and potatoes in a clean kitchen towel. Squeeze and discard all the excess liquid. Transfer the potatoes and onion to a bowl. Add 1 cup cheese, eggs, sour cream, salt, garlic powder, and black pepper to the potato mixture. Toss until thoroughly combined. Spray a medium baking dish or large oven-proof skillet with cooking spray, and fill with the potato-onion mixture Top with the remaining cheese and crumbled bacon, then transfer to the oven. Bake for 1 hour, or until the edges of the casserole are thoroughly browned, and the cheese on top is melted and bubbly.