Preheat the oven to 375 degrees. Line a baking sheet with parchment paper and set aside.
In a large bowl, whisk together the flour, sugar, baking powder, baking soda, and salt. Using a pastry blender or two knives, cut in the cold butter until the mixture resembles course crumbs. Stir in the fruit.
Beat the buttermilk and egg together in a small bowl and then add to the dry mixture. Mix until everything just comes together and then turn out the dough onto a lightly floured board. Knead briefly, 5-6 times, then place the dough onto the prepared baking sheet. Form the dough into an 8-inch disc. With a board knife or other large knife, cut the dough into 8 pieces, but do not separate the pieces.
Place the baking sheet into the preheated oven and bake for 25-30 minutes, or until the top is golden brown and the dough is cooked through.
Meanwhile, in a saucepan over very low heat, melt the butter and chocolate together until smooth. Remove from heat. Drizzle the chocolate over the scones. Serve warm or store, covered at room temperature for up to 2 days.