Chop the romaine, grate the Parmesan, and prepare a clean plate for the cooked tacos.
Stir together the Caesar dressing, lemon juice, 2 tablespoons Parmesan, and a pinch of black pepper.
Mix the ground chicken with garlic powder, onion powder, smoked paprika, salt, pepper, and 1/4 cup Parmesan.
Divide the chicken into 8 portions. Spread one portion over each tortilla in a thin layer about 1/4 inch thick.
Preheat a skillet over medium-high heat for 2 minutes. Add a thin coating of oil.
Place 2 or 3 tortillas in the skillet with the chicken facing down. Press firmly with a spatula for 10 seconds.
Flip each taco and cook the tortilla side for 1 to 2 minutes.
Check that the chicken has reached an internal temperature of 165°F or 74°C.
Lightly toss the romaine with about 3 tablespoons of Caesar sauce and the remaining Parmesan.
Top each warm taco with Caesar salad, reserved sauce, black pepper, and lemon.
Serve immediately.