In a food processor combine the sour cream, cilantro, lime juice, jalapeno pepper, and onion. Process until smooth. Pour into a small bowl and put in the refrigerator.
In a separate small bowl combine the paprika, brown sugar, oregano, garlic powder, cumin, red pepper, and black pepper. Stir to combine.
Heat the olive oil in a large skillet. Cover the tilapia fillets with the paprika mixture pressing into the fish to cover. Add the fish to the pan and cook 3-4 minutes on each side.
Remove from heat, cut into strips, and serve in a tortilla with sour cream mixture, avocado, and toppings.