Preheat oven to 375° F. Line a 12-cup muffin pan with cupcake liners.
In a medium bowl, stir together the dry ingredients: cocoa powder, flour, sugar, salt, baking powder, baking soda.
In a large bowl, stir together the wet ingredients: buttermilk, sour cream, melted then cooled butter, egg, vanilla.
Add the dry ingredients to the wet ingredients. Stir just until almost combined.
Add chocolate chips. Stir a couple times to combine.
Using a small cup measuring cup, pour muffin batter into bottom of the muffin tin cups, filling each cup about ¼ full.
Add a chocolate raspberry truffle ball to each muffin cup.
Cover the truffle ball with more muffin batter until each muffin cup is about ¾ full.
By hand, place raspberries on top of each muffin. Push them in slightly.
Bake muffins for 15 minutes. Turn the oven down to 325°F and bake for 3 more minutes. Test muffin with a toothpick to determine if they're cooked (remember the center will be molten). Remove from oven.
Allow to cool for 5 minutes in muffin tin. Then move to a cooling rack.
Optional: In the microwave, melt the remaining ¼ cup of ganache by heating for 20 second intervals. Stir between intervals and remove from microwave when it is melted. Use a spoon to drizzle ganache over cooked muffins.