Trim and snap green beans into thirds. (You can do this ahead of time.) Mince onion.
Put water on to boil to steam beans. As soon as water boils, steam beans for 12 to 17 minutes or until tender.
Melt butter or margarine and sauté onions until tender. Add steamed beans, basil, garlic powder and pepper.
Toss beans with basil sauce to coat evenly and serve.
Makes 4 servings.
Per serving: 46 calories, 1 g total fat (0 g saturated fat), 8 g carbohydrates, 2 g protein, 1 g dietary fiber, 7 mg sodium.