This elegant dish is a great way to use your food processor to make a delicious and impressive meal. Start by processing some cooked rice until it is finely chopped. Then, mix the rice with some chopped spinach and feta cheese. Stuff the mixture into some chicken breasts and bake in the oven until the chicken is cooked through. Serve hot with a side salad or some roasted vegetables. This dish is perfect for a special occasion or for a dinner party with friends.