Preheat your oven to 350°F. Grease a 9x13-inch baking pan.
In a mixing bowl, whisk together the flour, cocoa powder, baking soda, baking powder, and salt.
In a separate bowl, whisk the eggs. Incorporate the granulated sugar, brown sugar, vegetable oil, and vanilla extract. Stir until everything is thoroughly mixed.
Slowly add the dry ingredients to the wet ingredients, stirring until just combined.
Gently fold in the grated zucchini and chocolate chips.
Transfer the batter to the prepared pan. Bake for 30 to 40 minutes, or until thoroughly baked. A toothpick inserted into the center should come out clean.
Let the cake cool completely in the pan on a wire rack before decorating with frosting or slicing.