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Preheat the oven to 350 degrees F. Line an 8-inch square baking dish with parchment or grease with a little coconut oil or vegan butter.
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To make the flax egg, stir the flax meal and water in a small bowl. Set aside to gel for 5-10 minutes.
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Place 1 cup of the chopped chocolate in a medium glass bowl with the vegan butter. Place over a small saucepan filled with 1-2 inches of simmering water and stir until melted. Alternatively, melt in the microwave at 30-second intervals, stirring in between, until just melted. Transfer the melted chocolate and butter to the bowl of a mixer.
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Add the flax egg, coconut sugar, and vanilla to the mixing bowl with the melted chocolate. Beat on medium speed for 3-5 minutes, until smooth.
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Sprinkle the flour, baking powder, and cocoa powder on top of the wet ingredients. Beat again until just combined. Fold in the walnuts and remaining 1/4 cup chocolate chunks.
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Spread the brownie batter into the prepared baking dish. The batter will be thick and the back of a spoon works well for smoothing it in.
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Bake for 30-35 minutes. Immediately sprinkle the top with the salt. Let cool at least 20 minutes before cutting into squares.
Tips:
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These fudgy vegan brownies are rich. Though I’ve shown them cut into 9 large squares, I prefer to cut them into 36 small squares.
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You can use vegan chocolate chips, but we found these to be most delicious when using freshly chopped dark chocolate. Be sure not to accidentally buy bittersweet chocolate, however.
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Once completely cooled, store in an airtight container at room temperature for up to 3-4 days. They can also be frozen for up to 3 months.