Heat oven to 400°F. Spray bottoms only of 12 regular-size muffin cups with cooking spray or line with paper baking cups. In large bowl, mix 2 cups flour, 1/2 cup sugar, the baking powder, baking soda and salt. With spoon, stir in yogurt, oil, lemon peel and egg just until dry ingredients are moistened. Fold in raspberries.