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Preheat oven to 350°F . Grease a muffin tin or line with cupcake liners.
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In a large bowl, vigorously whisk together the flour + cocoa powder + sugar + baking soda + salt until there are no visible clumps.
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In a separate bowl, mix together warm water + vinegar + vanilla extract + olive oil.
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Pour the wet ingredients into the dry ingredients and stir only until they just come together. The mixture should be thin and rather lumpy.
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Pour the batter into the cupcake liners, filling them about two-thirds of the way. Place in the center of the oven and bake for 18 to 20 minutes, until skewer inserted in the center comes out clean.
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Remove from oven and let cool in the pan for 5 minutes, then remove from pan and place on the cooling rack.