Preheat the oven to 350°. Grease a loaf pan with nonstick cooking
Sift the flour, cocoa powder, baking soda and salt into a large bowl.
Add the butter, sugar, eggs, sour cream and vanilla, then mix with a
whisk until well combined.
Gently fold in the chocolate chips until they are evenly distributed.
Pour the batter into the prepared loaf pan. It should fill the pan a
little more than halfway.
Bake until a toothpick inserted into the center comes out clean, 50
minutes to 1 hour.
Let the bread cool for 15 minutes in the pan, then remove it from
the pan while it is still warm by inverting it onto a cooling rack.
Cool completely before slicing and serving. If desired, finish the loaf
with a dusting of confectioners’ sugar.