Preheat oven to 350° and grease 2 9x5 loaf pans.
Combine melted butter and sugar in a large bowl and stir until combined.
Add egg and buttermilk and mix well.
In a separate bowl, combine flour, baking powder, baking soda, pudding mix, and cocoa powder. Stir until mixed.
Slowly add dry ingredients to wet ingredients until fully incorporated.
Pour into prepared pans and bake for 25 minutes.
Remove from oven and top with mini chocolate chips.
Place back in oven and bake for another 20-25 min or until toothpick inserted in the center comes out clean.