1. Preheat your oven to 350°F (175°C) and prepare two 9-inch round cake pans by greasing and flouring them.
2. In a large bowl, whisk together the flour, sugar, cocoa powder, baking soda, baking powder, and salt.
3. In another bowl, combine the eggs, buttermilk, coffee, vegetable oil, and vanilla, mixing until smooth.
4. Merge the wet and dry mixtures, stirring until the batter is lump-free, then gently fold in the blackberries.
5. Transfer the batter to the prepared pans and bake for 30-35 minutes. Cool in the pans for 10 minutes before moving to a wire rack. Frost or dust with powdered sugar before serving.
Nutritional Information: A serving contains approximately 350 calories, with a good balance of carbohydrates, protein, and healthy fats.
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