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add all the meatball ingredients (excluding the olive oil) to a large bowl and mix well
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shape into 1 inch meatballs
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add the olive oil to a large skillet and heat over medium high heat
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add meatballs and cook the meatballs on all sides, add more oil if needed
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remove meatballs from skillet and set aside
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to the same skillet add butter and melt
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add onion and cook until onion is soft and translucent
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in a bowl add the cornstarch and beef broth and whisk
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add broth and remaining gravy ingredients to skillet, and cook for about 3 to 5 minutes, sauce should thicken
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if the sauce is too thick add a bit more beef broth
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taste for seasoning and adjust as necessary
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when the gravy is done add the meatballs back to the skillet and toss them around so they're covered in the gravy.
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garnish with parsley.
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serve over mashed potatoes