Chicken Taco Salad with Creamy Ranch

Name: Chicken Taco Salad with Creamy Ranch
Ingredients: * 2 chicken breast; * 1/2 teaspoon chili powder; * 1/2 teaspoon dried oregano; * 1/4 teaspoon garlic powder; * 1/4 teaspoon cumin; * salt and pepper to taste; * 1-2 head romaine, chopped; * 1 (14 oz) can black bean, rinsed and drained; * 1 cup chopped tomato; * 1/2 cup shredded cheddar; * 1/4 cup chopped cilantro; * 5 green onion, chopped; * 1 avocado, sliced; * crushed nacho cheese flavoured tortilla chip (optional); * optional ranch dressing; * 1/4 cup mayonnaise; * 1/4 cup buttermilk; * 2 tablespoon minced fresh chive; * 2 tablespoon minced fresh parsley; * 1 teaspoon minced fresh dill; * 1 teaspoon fresh lemon juice; * 1 small clove garlic, minced