Mince onion.
Peel sweet potato and dice.
Cut green beans into half inch length.
Make vegetable white sauce. In a skillet, heat 2 tablespoons olive oil and sauté onion over medium heat until tender. Then add sweet potatoes, carrot and green beans. Sauté for a couple of minutes. Then add dried basil. Stir well.
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.