Preheat oven to 350°.
In a medium mixing bowl, combine flour, sifted cocoa powder, baking powder, baking soda, and salt. Set aside.
In a large mixing bowl beat the butter with an electric mixer on medium speed for 30 seconds.
Add sugar, beat until fluffy. Add eggs, beating until well combined.
Add the flour mixture and buttermilk alternately to egg mixture, beating after each addition just until combined.
Spoon half of batter in miniature loaf pans then sprinkle with the mini chocolate chips.
Top each loaf pan with remaining batter and smooth evenly.
Bake for 35-45 minutes depending on the size of your loaf pans, or until wooden pick inserted into the center comes out clean. Cool completely before slicing.