"These scalloped potatoes are a decadent side dish that will impress your guests! Learn how to make them, plus, get tips for making the best potatoes...."
INGREDIENTS
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3 pounds potatoes (thinly sliced)
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½ onion (thinly sliced)
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9 tablespoons all-purpose flour (divided)
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6 tablespoons butter (diced and divided)
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salt and ground black pepper to taste
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3 cups whole milk, or as needed