Slow Cooker Au Gratin Potatoes Recipe - Mashed

"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
4 tablespoons butter
3 pounds russet potatoes
1 small yellow onion, finely diced or grated
¼ cup all-purpose flour
2 cups whole or 2% milk
2 teaspoons garlic powder
½ teaspoon salt
½ teaspoon freshly ground pepper
2 cups grated cheddar cheese
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