Preheat an oven to 350°F (180°C). Grease and flour a 4-by-8-inch (10-by-20-cm) loaf pan.
In a large bowl, combine the quick bread mix, butter, eggs and milk and stir until smooth and blended. Pour the batter into the prepared pan and spread evenly. Bake until a toothpick inserted into the center comes out clean, 55 to 60 minutes.
Transfer the pan to a wire rack and let cool for 10 minutes, then turn the loaf out onto the rack. Serve warm or at room temperature. Serves 10 to 12.
Williams-Sonoma Test Kitchen