
Pre-heat oven to 350F/180C. Grease and flour or spray an 8 inch loaf pan.
In a medium bowl whisk the flour, baking powder and salt.
In a large bowl, beat the butter, sugar and vanilla well, approximately 2 minutes, add the eggs and yolk, one at a time beating between each addition, Stir in the dry ingredients alternately with the milk.
Divide the batter in half, stir the chocolate chips and melted chocolate into one half, mix well. Spoon half the batter into the prepared loaf pan, top with the chocolate batter then the remaining plain on top. Bake for approximately 30-40 minutes check with a toothpick for doneness. Let cool 15 minutes in the pan then move to a wire rack to cool completely. Enjoy!