Preheat oven to 175 °C. Grease and lightly flour a square baking pan (ca. 20cmx20cm). In a double boiler, melt the butter and dark chocolate. Remove from stove. Add the sugar and mix using a wooden spoon. Add the eggs, one at a time, mixing with each addition. Add the vanilla extract and mix well.
Combine together the cocoa powder, buckwheat flour, baking powder and salt. Mix the dry ingredients into the wet ingredients. Pour the batter into the prepared pan and spread evenly. Bake for 25-30 minutes in the preheated oven. Allow to cool and enjoy.
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