Blueberry Filled Muffins

I found this recipe on the interent and added it to my muffin collection -- it's great for breakfast!

• Ready In: 35 mins
• Yields: 12 muffins

Ingredients

• 1⁄2 cup butter, softened
• 1 1⁄2 cups sugar
• 4  large eggs
• 1  teaspoon vanilla
• 3  cups flour
• 1  teaspoon baking powder
• 1⁄2 teaspoon salt
• 1⁄2 teaspoon  grated lemon, rind of
• 1  cup buttermilk
• 1  cup fresh blueberries or 1  cup frozen blueberries, thawed

Directions

1. Preheat oven to 350º.
2. Grease 12 standard size muffin cups.
3. To prepare muffins, in a large bowl, using a wooden spoon or an electric mixer set on medium speed, beat together butter and sugar until light and fluffy.
4. Add eggs, one at a time, beating well after each addition.
5. Beat in vanilla.
6. In a medium bowl, mix together flour, baking powder and salt.
7. Using a wooden spoon, stir flour mixture into egg mixture.
8. Fold in lemon zest.
9. Gradually stir in buttermilk until dry ingredients are just moistened.
10. Do not overmix.
11. Spoon batter into prepared pan, filling 2/3 full.
12. Spoon a heaping tablespoon of blueberries into center of each muffin.
13. Bake until lightly golden, 18 to 20 minutes.
14. Transfer to a wire rack and cool slightly.
15. Serve warm.