Marinate the chicken breast in balsamic vinegar for at least 30 minutes.
Preheat oven to 400 degrees F.
In a 9x13 casserole dish, add beans, cashews, tomatoes, artichoke hearts, and onion.
Season the chicken on both sides with salt and pepper to taste. Heat olive oil in a large skillet and brown the chicken on both sides for about 2 minutes on each side. (The chicken will be browned, but not cooked through; it will finish cooking in the oven.)
Nestle the browned chicken into the casserole dish, allowing it to just sit on top of all the other ingredients. Brush with more balsamic vinegar.
Add the chicken broth to the dish and lay in the oregano.
Cook for 15-20 minutes or until the chicken is completely cooked through.
Remove from the oven and add in the mozzarella.
Serve over rice, pasta, or just by itself!! Enjoy :)