In a large bowl add the butter, eggs, buttermilk and vanilla. Mix thoroughly. Add in the Chocolate Chunk Bread mix. Mix together just till moist. Pour batter into a large greased loaf pan or 18 muffin cups and bake in a 375F preheated oven for 40 minutes for the loaf or 16-18 minutes for the muffins Or, till a knife is inserted in the center and it comes out clean. Cool for 10 minutes before removing from pan.
