Season the chicken breasts with salt, pepper, and any preferred spices. Preheat the grill or grill pan over medium-high heat for about 5 minutes. Cook the chicken for 6-7 minutes on each side until the internal temperature reaches 165°F (75°C). Let it rest before slicing.

In a blender, combine the ripe avocado, lime juice, olive oil, garlic powder, salt, and pepper. Blend until smooth and creamy, adjusting seasoning to taste.

In a large mixing bowl, place the chopped romaine lettuce. Add the sliced grilled chicken on top, pour in the creamy avocado dressing, and gently toss until coated.

Sprinkle lime zest and fresh cracked pepper on top. Optionally add toppings like cherry tomatoes or herbs. Serve immediately.