Heart Healthy Lemon Raspberry Muffins

Ingredients

• 1 Tbsp lemon zest
• 1/2 cup sugar
• 1 cup nonfat buttermilk
• 1/3 cup safflower oil
• 2 egg whites
• 1 tsp vanilla extract
• 1 cup whole wheat flour
• 1 cup all-purpose flour
• 2 tsp baking powder
• 1 tsp baking soda
• 1/4 tsp salt
• 1 1/2 cups fresh raspberries