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Preheat oven to 350 F. Line a baking tray with parchment paper.
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Chop arugula and onion.
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Beat the three eggs in a bowl.
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Add all the other ingredients to the bowl with the eggs.
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Mix together and form into balls with your hands or ice cream scoop and place on the baking tray.
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Bake for 15 - 20 minutes.