Kale, Swiss Chard, Chicken, and Feta Salad

Ingredients

• 1/2 cup cider vinegar
• 2 teaspoons honey
• 1/2 teaspoon salt
• 1/2 teaspoon ground black pepper
• 1/2 teaspoon dried oregano optional
• 1/2 cup olive oil
• 1 bunch kale torn into bite-sized pieces
• 1 bunch Swiss chard torn into bite-sized pieces
• 1 pound skinless boneless chicken breast grilled, sliced
• 6 ounces crumbled feta cheese or more to taste
• 1/3 cup raisins
• 1/3 cup toasted walnuts chopped