Preheat your oven to 350°F (175°C) and prepare a greased 9x13 inch baking pan.

In a large mixing bowl, whisk together the all-purpose flour, cocoa powder, baking soda, baking powder, and salt.

In another bowl, mix granulated sugar, vegetable oil, eggs, and vanilla extract until smooth.

Gradually combine the dry ingredients with the wet mixture until just mixed.

Fold in the grated zucchini until it's evenly distributed.

Pour the batter into the prepared baking pan and smooth the top.

Bake for 30-35 minutes, checking with a toothpick for doneness.

Let the cake cool in the pan for about 10 minutes before transferring to a wire rack.

Once completely cooled, frost with chocolate or cream cheese frosting if desired.

Slice and serve to enjoy!