In a large baking dish place the salmon fillets. Season with cumin, onion powder, chili powder, garlic powder, salt and pepper.
Place the baking dish in the oven and bake for 15 to 20 minutes or until the salmon is cooked through.
Heat the tortillas on a nonstick skillet, then wrap them in aluminum foil to keep them warm.To assemble: spread one tortilla with sour cream, then top with cabbage, salmon, avocado and fresh cilantro. Season with salt and pepper to taste and drizzle lime juice on top. Repeat the process with the remaining tortillas or just let every person assemble their own tacos.