Brush chicken breasts with oil; season with salt and pepper, to taste. Place chicken in 2-quart shallow baking dish; bake 25 to 30 minutes or until no longer pink in center (165 degrees F.). Cool chicken enough to handle; slice into thin strips.
Combine salad blend, vegetables from pouch, garbanzo beans, cherry tomatoes, olives and red onion in large bowl. Toss with Greek Vinaigrette, to taste. Divide salad mixture on 4 large plates. Top each with sliced chicken. Sprinkle with feta cheese.
Whisk together 1/2 cup olive oil, 1/4 cup white wine vinegar, 2 teaspoons grated lemon peel, 1 teaspoon dried oregano crushed, salt and black pepper, to taste until well blended. Makes about 1 cup.