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Brown the ground beef in a skillet, then drain off any excess grease.
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Lightly spray the slow cooker with nonstick cooking spray.
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Add all of the ingredients except the mashed potatoes to the slow cooker and stir to combine.
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Cover and cook on Low for about 3-4 hours.
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During the last 2 hours of cooking, spread the mashed potatoes evenly over the top.
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Continue cooking until heated through, then serve warm.