In a large mixing bowl, combine flour, cocoa powder, salt, baking powder, and baking soda.
In a medium mixing bowl, combine sourdough starter, eggs, oil, buttermilk, sour cream, sugar, and vanilla.
Add wet ingredients from medium bowl to dry ingredients in large bowl. Stir to thoroughly combine. Add 1¾ cup of chocolate chips.
Use a food scoop to add batter to muffin liners in muffin tin. Then sprinkle each with 5-6 chocolate chips.
Place in oven and bake for 5 minutes. DO NOT OPEN THE OVEN, but reduce heat to 350degF. Continue baking 20 minutes more. Check for doneness with a toothpick in the center.
Remove from oven once toothpick comes out clean. Transfer to a cooling rack. Enjoy warm or cooled.