Grate zucchini and measure out 2 cups of loosely packed shreds. Place them on a paper towel-lined plate until you need them.
Combine sugar, oil, and vanilla extract in a bowl. It will be crumbly.
Combine flour, cocoa, baking soda, and salt in a separate bowl.
Add the wet ingredients to the dry ingredients and cream the mixtures together. The batter will be thick.
Fold the grated zucchini into the batter and stir until distributed throughout. The batter becomes wetter as the zucchini is incorporated. So, stir well.
Spread the batter into an 8" x 10" glass baking dish spritzed with nonstick spray.
Bake for approximately 25-30 minutes at 350°F or until the brownies are firm and begin to pull from the sides of the pan. Don't overcook. It's better to undercook. Allow the brownies to cool before serving.
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Notes
See step-by-step pictures and more tips above.Top Tips:
Mix the dry and wet ingredients in separate bowls to ensure that they are thoroughly mixed.
Allow the zucchini brownies to cool completely. The flavors will continue to meld together during this time.
Don't overcook the brownies, or they will become crumbly. Err on the side of undercooking them.
Storage:Zucchini brownies are best kept in an airtight container at room temperature for up to 3 days.For longer storage, refrigerate them for up to a week. Refrigerating can help maintain their moisture and fudgy texture. Allow them to come to room temperature before serving for the best flavor.