Preheat your oven to 350°F (175°C). Grease and line two 9-inch round cake pans with parchment paper.
In a mixing bowl, combine the flour, baking powder, baking soda, salt, and cocoa powder. Whisk until well mixed and set aside.
In a large bowl, using an electric mixer, cream together the granulated sugar, brown sugar, and butter until light and fluffy.
Add the eggs, one at a time, mixing well after each addition. Stir in the vanilla extract.
Gradually add the dry ingredients to the wet mixture alternatively with the buttermilk, beginning and ending with the dry ingredients. Mix until just combined.
Carefully stir in the boiling water to the batter until smooth. Fold in the raspberries and dark chocolate chips.
Divide the batter equally between the prepared cake pans.
Bake in the preheated oven for 30 minutes, or until a toothpick inserted into the center of the cakes comes out clean.
Allow the cakes to cool in the pans for about 10 minutes before transferring to a cooling rack to cool completely.
Once cooled, frost and layer the cakes with your favorite chocolate frosting, adding fresh raspberries on top for garnish.