Beef shepherd's pie is a classic comfort food dish that is perfect for a cozy dinner. Start by browning ground beef with onions, garlic, and carrots. Season with herbs like thyme and rosemary. Transfer the beef mixture to a baking dish and top with mashed potatoes. Bake in the oven until the potatoes are golden and the filling is bubbling. This hearty and satisfying dish is perfect for a family meal or a potluck gathering.