- Preheat oven to 400°F.
- Grease a 12 cup muffin tin.
- In a large bowl combine flour, sugar, baking powder and salt. Stir in walnuts and lemon peel.
- In a small bowl beat egg, milk, butter and vanilla.
- Pour egg mixture into dry ingredients and stir just until flour is moistened (batter will be lumpy). Fold in blueberries.
- Spoon into muffin cups and bake 20 to 22 minutes or until tops are golden.