Prep: 1. Preheat oven to 400. 2. Remove any leaves from cauliflower. Make: 1. Season the cauliflower with salt and pepper, place on a baking sheet and roast for 15-20 minutes. 2. Meanwhile, combine yogurt, mustard, and butter. 3. Remove cauliflower from oven and spread with mixture. 4. Return to oven and roast until soft and browned, 40-45 minutes.