To prepare the chicken: In a deep bowl, place the chicken strips, olive oil, black pepper, salt, garlic powder, and onion powder.
Mix the ingredients well until combined. Cover the bowl and place it in the refrigerator for about 4 hours.
Melt the butter in a wide pan over medium heat. Add the chicken strips and cook until completely done, stirring occasionally.
To prepare the dressing: In a bowl, mix the mayonnaise, lemon juice, garlic, cream cheese, Parmesan cheese, salt, black pepper, and oregano until well combined.
Place the chopped lettuce on a serving plate, then arrange the cooked chicken strips on top.
Pour the prepared dressing evenly over the chicken. Sprinkle the Parmesan cheese on top of the salad and serve.