Preheat oven to 450.
Rub salmon with olive oil, season with salt and pepper and cover with Cajun seasoning. Place on parchment paper lined baking tray and cook in oven for ten minutes until fish is cooked through and flaky.
Wrap tacos in aluminum foil and heat in oven for five minutes. Remove and keep covered until ready to serve.
While you salmon is cooking toss together the mango, red onion, roma tomatoes, and jalapeno. Stir until combined and season with salt and pepper to taste.
In a food processor or blender, add the avocados, sour cream, milk and lime juice. Blend until very smooth.
To assemble tacos, use a fork to roughly shred the salmon, place a spoonful of avocado crema, then add your flaky salmon, and spoon over mango salsa. Garnish with cilantro and enjoy.