Preheat oven to 450°F (232°C) and line a baking pan with foil.
Add cabbage and kale to a baking pan and toss with 1/3 of the avocado oil. Bake for 6 minutes. Remove from oven and stir.
Pat salmon dry and season. Place salmon on top of vegetables. Bake until salmon is cooked thorugh (10 minutes).
Meanwhile, add remaining avacodo oil, dill, vinegar, mustard, salt and pepper to a mason jar. Stir or shake well.
Drizzle with dressing and enjoy!