Reduce heat and add all-purpose flour. Stir well to coat and then add soymilk little by little stirring constantly. Simmer until thickened stirring constantly. Add salt and pepper to taste.
Put cooked rice into 8" x 8" casserole and pour the vegetable white sauce over the rice.
Sprinkle panko on top.
Bake at 425 degrees F for 15- 20 minutes or until browned.