Preheat your oven to 350°F (175°C). Lightly grease an 8x8-inch baking pan or line it with parchment paper.
Mix Dry Ingredients: In a medium bowl, whisk together flour, cocoa powder, baking soda, and salt.
Combine Wet Ingredients: In a large bowl, stir together oil, sugar, and vanilla until smooth.
Add Zucchini: Fold in the shredded zucchini. Don’t worry if it looks a bit dry—the zucchini will release moisture as it bakes.
Combine & Add Chocolate: Add the dry ingredients to the wet and stir until just combined. Fold in the chocolate chips.
Bake: Spread the batter evenly in your prepared pan. Sprinkle with extra chocolate chips if you like. Bake for 25–28 minutes, or until a toothpick comes out with a few moist crumbs.
Cool & Slice: Let cool completely in the pan before slicing into squares. Enjoy!