Prepare rice as package directs using 2 cups water. Combine cheese and flour; stir into rice. Spread evenly into 11x7" baking dish. Season chicken with salt and pepper. In shallow dish, combine egg and water. Dip chicken in egg mixture; roll in crumbs. In large skillet, melt butter; cook until golden. Preheat oven to 350 degrees. Arrange chicken on rice; bake 35 to 40 minutes or until bubbly. In small saucepan, combine soup, milk and pimientos; heat stirring until smooth. Serve with chicken; garnish with mushrooms. Refrigerate leftovers.