Omaha Steaks Heidelberg Breakfast Cassero Food. This old-world style casserole features a classic combination of all-natural potato sausage, bacon, red potato slices, portabello mushrooms, onions, pepper, Gruyere and Jack cheese. Serve for a hearty breakfast or dinner, or a satisfying side dish with your main course. The rich flavor gives it that homemade taste with gourmet flair.