For enhanced flavor, add a teaspoon of Worcestershire sauce to the meatloaf mixture. Avoid overmixing the meatloaf to prevent toughness. To customize, consider adding sautéed mushrooms and garlic or steamed broccoli for a veggie boost, cayenne pepper or diced jalapeños for spice, or different cheeses like Gruyère or smoked Gouda. A crunchy topping can be achieved with panko breadcrumbs mixed with melted butter. Leftovers can be stored in the refrigerator for up to 4 days and are best reheated in the oven at 350°F for about 20 minutes, covered with foil.