Chicken Salad Avocado Recipe

4 cups green leafy lettuce

or to taste

1 ½ cups thinly sliced cooked chicken breast

1 cup sliced black olives

½ cup thinly sliced green bell pepper

½ cup thinly sliced red bell pepper

¼ cup diced red onion

⅓ cup vegetable oil

¼ cup red wine vinegar

¼ cup fresh lemon juice

1 tablespoon white sugar

1 teaspoon salt

½ teaspoon ground black pepper

⅛ teaspoon chopped garlic

or more to taste

1 avocado - peeled

pitted

and thinly sliced