This Slow Cooker Corned Beef Hash Casserole is a hearty and comforting dish that is perfect for breakfast or brunch. Made with tender corned beef, potatoes, onions, and bell peppers, this casserole is packed with flavor. The slow cooker method ensures that the corned beef is tender and the flavors are well-developed. Serve this casserole with a side of eggs for a complete and satisfying meal.