"This slow cooker au gratin potatoes recipe is the ultimate umami-heavy accompaniment to a juicy steak or Impossible burger, requiring just 15 minutes to prep...."
INGREDIENTS
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4 tablespoons butter
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3 pounds russet potatoes
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1 small yellow onion, finely diced or grated
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¼ cup all-purpose flour
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2 cups whole or 2% milk
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2 teaspoons garlic powder
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½ teaspoon salt
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½ teaspoon freshly ground pepper
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2 cups grated cheddar cheese