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Coat your slow cooker pot with cooking spray. Set to HIGH (4-5 hours) or LOW (6-7).
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Add onion, cream of mushroom soup, sliced mushrooms, thyme, gravy packet, milk and water. Stir to combine.
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Pour in entire package of meatballs. Stir and cover.
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Allow to cook, stirring occasionally.
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15 minutes before serving, add sour cream and re-cover. Cook egg noodles.
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Serve over noodles, with a side salad or veggie.