If you don't have an air fryer, these are very easy to make in the oven. 1. Pre heat oven to 400 degrees 2. Drizzle oil and seasonings over the frozen brussels sprouts and stir well. No need to thaw or chop. 3. Lay the sprouts out in a single layer on a baking sheet. Roast until they have crispy edges and become golden brown -  between 25-35 minutes. Shake the pan halfway through to ensure they roast evenly and have the best texture. Sprinkle a little salt over them when they're still hot.