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Meanwhile, preheat a skillet over medium-high heat with avocado oil.
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In a shallow bowl, crack the eggs and beat until well combined.
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In another shallow bowl, mix in arrowroot flour, kosher salt, black pepper, and garlic powder.
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Add the onion slices to the eggs making sure they are completely coated.
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Remove onion slices and place in arrowroot flour mixture. Make sure the onion slices are coated.
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Using tongs, remove onions from arrowroot flour mixture, shake off excess, and then add to the preheated skillet.
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Fry the onion slices for about 7-10 minutes or until golden brown making sure to flip the onions every so often.
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Serve the crispy onions over the meatloaf burgers with a little more BBQ sauce.