Preheat oven to 400 degrees.  Combine cauliflower florets, chopped red onion, and chopped mushrooms on a sheet pan and sprinkle with Black Garlic Ramen Pepper and salt.  Drizzle oil over the vegetables and combine with your hands to ensure all vegetables are evenly coated.  Roast for 30 minutes, rotating pan once halfway through cooking. Use a spatula to flip over the vegetables every 10 minutes to ensure even caramelization.