Preheat oven to 350°F (175°C). Grease the pan with butter and dust it with flour.
In a blender, combine eggs, oil, chopped carrots, and sugar. Blend until smooth.
3 large eggs, 150 ml vegetable oil, 200 g peeled and chopped carrots, 275 g sugar
Transfer to a large bowl and whisk in the flour and baking powder until just combined.
205 g all-purpose flour, 1 tbsp baking powder
Divide the batter in half. In one half, sift in the cocoa powder and mix until incorporated.
25 g unsweetened cocoa powder
Pour half of the carrot batter into the baking pan. Then, add half of the chocolate batter on top.
Use a toothpick to gently swirl the batters together in circular motions.
Repeat with the remaining carrot and chocolate batters, then swirl again.
Bake for 40 minutes, or until a toothpick inserted in the center comes out clean.
Let cool, then dust with powdered sugar using a fine mesh sieve.
powder sugar