INGREDIENTS
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1 package sliced bacon, diced
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5 tablespoons unsalted butter
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1/4 cup all-purpose flour
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4 cups milk, or more if needed
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6 russet potatoes, peeled and cubed
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3 green onions, sliced thin
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1 1/2 cup shredded cheddar cheese + more for garnish
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1/2 cup sour cream
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salt and pepper, to taste