Preheat your oven to 175°C (350°F). Line a muffin tin with paper liners and set aside.
In a large mixing bowl, use an electric mixer to beat together the caster sugar, light brown sugar, vegetable oil, eggs, and vanilla extract until smooth and well combined.
300 Grams Caster sugar, 110 Grams Light brown sugar, 230 Milliliters Vegetable oil, 3 Large eggs, 2 Teaspoons Vanilla extract
In a separate bowl, whisk together the flour, cocoa powder, salt, baking soda, and ground cinnamon.