Cheesiest Scalloped Potatoes

Ingredients

• 1 tablespoon unsalted butter, plus more for greasing
• 1 tablespoon extra-virgin olive oil
• 1 medium sweet onion, cut into 1/4-inch-thick slices
• Kosher salt and freshly ground pepper
• 1 cup heavy cream
• 1 cup whole milk
• 1 garlic clove, grated
• 2 sprigs fresh thyme
• 2 pounds Yukon Gold potatoes (6-8 medium)
• 1/4 cup fresh Parmigiano-Reggiano cheese, finely grated
• 3 1/2 ounces Gruyère cheese, shredded (1 packed cup)

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