Leftover Mashed Potato Pancakes — The Mom 100

Ingredients

• 2 cups leftover mashed potatoes
• 1 large egg
• ⅓ cup all-purpose flour
• 4 tablespoons minced chives ((divided))
• 1 cup grated cheese ((such as cheddar, gouda, or fontina))
• Kosher salt and freshly ground black pepper ((to taste))
• 2 tablespoons olive oil ((divided))
• 2 tablespoons unsalted butter ((divided))
• Sour cream ((for serving))