**Marinate Chicken:** In a bowl, combine chicken strips and buttermilk. Let marinate for 30 minutes to 1 hour in the refrigerator.
**Prepare Bread Coating:** In a separate bowl, mix flour, cornstarch, garlic powder, smoked paprika, cayenne pepper, salt, and pepper.
**Fry Chicken:** Heat oil in a deep fryer or skillet to 350°F (175°C). Dredge marinated chicken in the flour mixture, coating evenly. Fry in batches for 5-7 minutes, or until golden and cooked through. Place on a baking sheet lined with paper towels to drain excess oil.
**Make Street Corn:** In a mixing bowl, combine corn kernels, mayonnaise, sour cream, cotija cheese, chili powder, lime juice, and cilantro. Stir until well combined.
**Assemble Tacos:** Warm the tortillas. Add a layer of shredded lettuce (if using), a few pieces of fried chicken, and a generous scoop of street corn.
**Serve:** Top with additional cheese, cilantro, and a drizzle of hot sauce or salsa if desired.