Double chocolate buckwheat brownies, made with cocoa and dark chocolate, are a rich, fudgy treat that will satisfy any chocolate craving! Do not—I repeat—DO NOT make this recipe if you like cake-like brownies.
Preheat the oven to 350ºF (180ºC). Lightly butter an 8-inch (20-cm) square baking pan and line it with parchment paper. Set aside.
Place a medium-sized pot on the stove with 1 to 2 inches of water inside. Set a large heatproof mixing bowl on top of the pot so it sits snugly without touching the water. Bring the water to a boil then reduce the heat to a lively simmer. Add the dark chocolate and butter to the bowl and heat until smooth and melted, about 3 to 4 minutes.
Remove the bowl from the pot and turn off the heat. Add both the brown and granulated sugar to the melted chocolate and whisk to combine.
Add the eggs and vanilla to the chocolate. Whisk smooth.
Sprinkle the buckwheat flour, cocoa, and salt in the bowl. Use a rubber spatula or wooden spoon to stir the brownie batter until the flour is all mixed in.
Pour the batter into the prepared square pan. Use an offset spatula or butter knife to smooth the top. Bake the brownies for 22 to 24 minutes, or until the edges are set and the middle is still slightly underdone. Remove the pan from the oven and transfer it to a wire rack. Let the brownies cool in the pan before lifting them out, slicing, and serving.
Notes
Room-temperature eggs whisk much easier than cold eggs from the fridge. If you don't have room temperature eggs, place cold eggs in a bowl of hot tap water and let them sit for a few minutes to warm.
Once cool, store the brownies in an airtight container with a lid. You can keep them on the counter for a couple of days, or keep them in the fridge for up to a week.