"Sheet pan scalloped potatoes are the perfect creamy potato side dish! Made from scratch, and indulgent but simple to make, this is a real show stopper!..."
INGREDIENTS
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1 tablespoon unsalted butter
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2 tablespoons olive oil
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1 medium yellow onion (peeled and diced)
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3 pounds medium Yukon Gold potatoes (cut into 1/8-inch slices)
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Freshly grated black pepper *SEE NOTE
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12 ounces grated Gruyere (Emmental, Jarlsburg or Swiss cheese)
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1 cup grated Parmesan cheese
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2 cups heavy cream
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1 tablespoon Dijon mustard
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2 tablespoons chopped fresh rosemary or thyme leaves (optional)