Preheat the oven to 350 degrees F. and line a large baking sheet with parchment paper.
In the bowl of a stand mixer, beat the butter and sugar until smooth.
Add the eggs and vanilla and combine.
In a separate bowl, combine the flour, cocoa, baking powder, and salt.
Add the dry ingredients to the wet ingredients, and mix until just combined.
Fold in the chocolate chips.
Divide the dough in half and shape into two loaf shapes - about 12 inches long and 2-3 inches wide. They should be about ½ inch thick. Make sure they are about 3-4 inches apart on the baking sheet so they don’t touch while they are baking.
Bake for 30 minutes then remove and allow to cool completely,
Once cooled, gently slice into about 11-12 slices per loaf and place back on the baking sheet face up.
Bake for 15 minutes, then flip over to the other side and bake for another 15 minutes. If they are still not crunchy, bake for a couple extra minutes, but remember they will harden up a little more after they cool.
Once cooled, drizzle with some melted chocolate if desired.