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Preheat oven to 400°F.
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Do not peel zucchini, coarsely grate.
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Spread out over paper towels, top with more paper towels and press to remove excess water.
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Turn into a large bowl.
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Sprinkle with cornstarch, toss to mix.
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Add cheese and onions, stir to mix.
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whisk egg, then stir into zucchini mixture along with salt and pepper.
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Line a baking sheet with parchment paper.
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Scoop about 1/4 cup mixture onto baking sheet, then gently press down.
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Repeat with remaining mixture.
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Bake in center of preheated oven until fritters start to firm up and are golden brown on the bottom, about 15 minutes.
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Turn fritters carefully, they will still be soft at this stage.
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Continue baking until set and a deep golden on both sides, about 8 more minutes.
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Let stand a couple minutes to firms up before serving.
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Sauce:.
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Squeeze 1 tbs juice from lemon into a small bowl.
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Stir in mayo and mustard.
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Serve fritters with a dollop of sauce.