Now, let’s get to the fun part — baking! Follow these steps to create your own luscious masterpiece:

1. Preheat your oven to 350°F (175°C). Grease a loaf pan with butter and dust with flour, tapping out the excess.
2. In a medium bowl, whisk together the all-purpose flour, whole wheat flour, cocoa powder, baking soda, baking powder, and salt. Set aside.
3. In a large bowl, cream the butter and sugar until light and fluffy. This step reminds me of the times I would sneak a taste of abuela’s buttery concoctions, savoring the sweetness!
4. Add the eggs, one at a time, beating well after each addition. Stir in the vanilla extract.
5. Gradually add the dry ingredients to the wet mixture, alternating with the buttermilk, beginning and ending with the dry ingredients. Mix until just combined.
6. Gently fold in the chocolate chunks and chopped pecans, ensuring they are evenly distributed throughout the batter.
7. Pour the batter into the prepared loaf pan, smoothing the top with a spatula.
8. Bake for 50 to 60 minutes, or until a toothpick inserted into the center comes out clean. The aroma will transport you to a place of comfort and warmth, much like those cherished moments in my childhood kitchen.
9. Allow the loaf to cool in the pan for about 10 minutes before transferring it to a wire rack to cool completely.