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Scrub potatoes, removing any bad spots.
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Boil until just fork tender, about 20 minutes.
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Chop the bacon slices and fry or microwave until cooked. Set aside.
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Drain potatoes and preheat oven to 350°F.
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Let cool a little, but while somewhat hot, with skins on, cut into cubes, or bite size pieces. Place in a large bowl.
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Add the butter, Monterey jack cheese, bacon, sour cream, salt, pepper, and garlic powder to the potatoes in the bowl. Stir to combine.
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Spray a 2" deep casserole dish, mainly on the sides, with the Pam.
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Drizzle all the ranch dressing on the bottom of the dish, coating the entire bottom. I use homemade ranch dressing from scratch, but Hidden Valley is awesome or use whatever you prefer.
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Add the potato mixture into the casserole dish, forming an even layer.
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Sprinkle the cheddar cheese and green onions on top.
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Bake until cheese is nice and bubbly, or about 15 minutes.