Cauliflower Casserole

Bahan-bahan (8 porsi)

• 2 medium heads of cauliflower
• 2 tablespoons extra-virgin olive oil
• 1 teaspoon garlic powder
• ¾ teaspoon kosher salt
• ½ teaspoon ground black pepper
• ¼ teaspoon ground nutmeg
• 6 slices bacon
• 4 ounces reduced-fat cream cheese (at room temperature)
• ¼ cup nonfat plain Greek yogurt
• ⅔ cup freshly grated Gruyere (or similar melty, nutty, alpine-style cheese, divided)
• ¼ cup finely grated Parmesan cheese (divided)
• 3 tablespoons fresh chives (chopped)