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Place your mashed potatoes, eggs, cheese, and one cup of flour into a large bowl.
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Stir until WELL combined.
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Gradually add up to one more cup of flour until the potato mixture become s thick enough to hold their shape on the griddle.
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Heat a large skillet with about 1/4″ oil in the bottom over medium high heat.
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Once the oil is hot, drop the batter by 3/4 cup full (or smaller if you’d like) into the oil. Use a spoon to spread slightly into a round “pancake”.
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Cook until the pancake is golden brown on one side. Then flip and continue to cook until the patty is golden brown on the second side and cooked through.
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Place a wire rack on a baking sheet. As you remove the potato cakes, place them on the wire rack so any extra oil drips down and they don’t get soggy.
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Top with sour cream and green onions.
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Serve immediately.