Preheat your oven to 350°F (175°C) and prepare a 9×13-inch baking pan.

Grate the zucchini, then gently squeeze it with a towel to remove any excess moisture.

Whisk together the eggs, vegetable oil, brown sugar, granulated sugar, and vanilla in a large mixing bowl until smooth.

Mix the flour, baking powder, baking soda, salt, and optional cinnamon in a separate bowl.

Combine the dry ingredients into the wet mixture, stirring gently until just combined.

Fold in the grated zucchini and chocolate chips carefully.

Spread the batter evenly into the prepared pan.

Bake for 30–35 minutes, or until a toothpick inserted into the center comes out clean.

Cool the baked bars completely in the pan before cutting them into squares.