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1. Preheat oven to 350 degrees and grease (I always line mine with parchment paper) a 8 or 9 inch square pan.
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2. Combine brownie mix, butter, eggs and zucchini. Stir until smooth.
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3. Pour into pan and bake for 30-40 minutes or until an inserted toothpick comes out somewhat clean. You make want them to still be a little fudgey.
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4. Let cool.
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5. Optional Frosting: Beat butter, cocoa powder, vanilla extract, milk and 1 cup powdered sugar together until smooth. Continue to add powdered sugar until you reach your desired consistency. Frost cooled brownies and top with sprinkles.