"This casserole combines two of the most wonderful side dishes: mashed potatoes and French onion dip to create a delicious French onion potato casserole!..."
INGREDIENTS
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3 tbsp unsalted butter
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3 large onions (sliced)
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½ tsp kosher salt
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2 tsp Worcestershire sauce
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3 cloves garlic (minced)
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3 lb russet potatoes
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8 oz cream cheese
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1 cup sour cream
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¾ cup whole milk (warmed)
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1 tsp black pepper
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1 ½ tsp kosher salt
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¾ cup Parmesan cheese
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2 cups shredded Monterey Jack cheese
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chives