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Strain zucchini and onion in a salad spinner to remove excess moisture.
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Transfer to a large bowl and stir in the panko.
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Whisk eggs, salt and baking powder together in a small bowl then stir into zucchini mixture.
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Heat 2T oil in a nonstick skillet over medium. When hot drop mounds of batter into thepan using a 1/3-cup measure.
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Fry cakes until golden, then carefully flip and cook until golden on the other side, about 4 minutes per side.
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Transfer to a paper towel-lined plae and keep warm; fry remaining cakes in remaining oil.
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To serve divide Diavolo Sauce among 4 plates, top with 2 cakes, and garnish with Parmesan and Parsley.