Cauliflower Mashed Potatoes

Bahan-bahan (4 porsi)

• 6 cups cauliflower florets (about 24 ounces or 1 large head)
• 2 cloves garlic (smashed and peeled)
• ¾ teaspoon kosher salt (divided)
• 2 tablespoons unsalted butter
• ¼ cup full-fat Greek yogurt (or sour cream)
• 2 tablespoons nonfat milk (or milk of choice, plus additional as needed)
• ¼ cup finely grated Parmesan cheese
• ¼ teaspoon freshly ground black pepper
• Chopped fresh chives (optional for serving)