Directions

1. Preheat oven to 375 degrees F (190 degrees C).
2. In a large bowl stir together the spinach souffle, rice, milk, 1/2 cup Swiss cheese, onion, mustard and salt. Transfer mixture to a 9x13 inch baking dish, and cover with aluminum foil or a lid.
3. Bake for 25 minutes in the preheated oven.
4. Meanwhile, in a large nonstick skillet, saute the chicken breasts in oil until both sides are golden brown and the juices run clear. Arrange the chicken on top of the spinach mixture.
5. In a small bowl, combine the bread crumbs, butter or margarine and remaining 1/2 cup Swiss cheese; sprinkle over the chicken. Bake uncovered for an additional 25 minutes, or until the spinach mixture is set, the chicken is cooked through and juices run clear.