Boil cauliflower 5-7 minutes. Sautee onion while cauliflower cooks. Combine onion and all other ingredients in small bowl. Once cauliflower is tender, lay flat in large oven-safe casserole pan. Spoon cheese mixture over florets. Bake 350 F for 30 minutes. I broil it for 3-5 minutes to brown the top right before serving. Serves 4 as a side. Enjoy!