Hasselback Sweet Potatoes

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4 medium sweet potatoes

1 tablespoon unsalted butter, melted

1 teaspoon olive oil

1 teaspoon finely chopped fresh thyme leaves

1 garlic clove, finely grated on a microplane

Kosher salt and freshly ground black pepper

Kosher salt and freshly ground black pepper 

1/3 cup nonfat Greek-style yogurt

1 scallion, white and green parts chopped