Pre-heat the oven to 425. You can also get your rice cooking at this time if you are serving your bowls with rice – it will be done by the time you finish the fish!
Season both sides of the mahi mahi with taco season, and place on a sheet tray. Toss the cabbage, onion, and jalepeno slices with avocado oil, sea salt, and pepper and spread out on another tray.
Place the veggie tray on the middle rack of the oven, and the fish on the rack below that. Bake at 425 degrees for 25 minutes, until the fish is cooked through, and the veggies are lightly caramelized.
While the fish/veggies are baking, you can make the aioli. Place all of the aioli ingredients into a pint mason jar, and use an immersion blender to blend into a creamy sauce. If you do not have an immersion blender, put everything into your food processor EXCEPT the oil. Press blend, and then use the oil drip cup to slowly drizzle the oil in as it is blending so it can emulsify.
After the fish/veggies cook, you can assemble your bowls. Veggies and rice (or cauli-rice) down first, and everything else surrounding it! Drizzle the aioli and serve with lime wedges.