Preheat oven to 400°F. Liberally spray a large rimmed baking pan with cooking spray or brush with olive oil. Set aside. Place fish fillets in a single layer on a platter.
In a small bowl, mix together seasonings blend. Reserve 1 tsp for taco sauce. Season fish on all sides. arrange on prepared sheet. Spray liberally with cooking spray, an oil spritzer or drizzle with olive oil.
Bake for 8-10 minutes or until fish flakes easily with a fork. Adjust time depending on thickness of fillets.
Meanwhile, in a mixing bowl, mix together sour cream, mayonnaise, lime juice and reserved seasoning. Add a few dashes of hot sauce or sriracha to taste. Keep chilled until serving. (This can be made up to one day in advance and chilled)
Divide fish between warmed tacos, dressing with taco sauce, shredded purple cabbage or radicchio, pico de gallo, avocado, onion, jalapeno and queso or any of your favorite taco toppings.