Maple Walnut Muffins

Ingredients

• 3 Egg whites; lightly beaten
• 1/4 ts Salt
• 1 c Sugar
• 1/2 ts Baking soda
• 8 oz Plain nonfat yogurt
• 1 ts Imitation maple flavoring
• 1 ts Baking Powder
• 2 1/4 c All-purpose flour
• 1/4 c Walnuts chopped
• Vegetable cooking spray
• 2 tb Maple syrup
• 1/2 c Reduced-calorie margarine;