Chopped Greek Salad With Chicken

2 tablespoons extra-virgin olive oil

1 tablespoon chopped fresh dill (or 1 teaspoon dried oregano)

1 teaspoon garlic powder

1/4 teaspoon salt

1/4 teaspoon fresh ground pepper

6 cups chopped romaine lettuce

2 1/2 cups chopped cooked chicken

2 medium tomatoes , chopped

1 medium cucumber , peeled, seeded, chopped

1/2 cup finely chopped red onion

1/2 cup sliced ripe black olives

1/2 cup crumbled feta cheese