Kale, Swiss Chard and Chicken Salad

1/2 cup cider vinegar

2 1/2 tsp honey

1/2 tsp salt

1/2 tsp ground black pepper

1/2 tsp dried oregano (optional)

1/2 cup olive oil

1 bunch Swiss chard, torn into bite-sized pieces

1 bunch kale, torn into bite-sized pieces

1 pound grilled skinless, boneless chicken breast, sliced or shredded

1 (6 ounce) container crumbled feta cheese

1/3 cup raisins (optional)

1/3 cup chopped, toasted walnuts

Whisk vinegar, honey, salt, pepper, and oregano in a bowl until the honey has dissolved. Whisk in the olive oil until evenly blended. Place the kale, Swiss chard, chicken, feta cheese, raisins, and walnuts into a bowl to toss with the dressing.