Birthday Blueberry Muffins

My lil guy, Big K, is 4 today. His favorite fruit is blueberries. So in his honor today, I made Big K's Birthday Blueberry Muffins.

• 1 3/4 cups all-purpose flour
• 1/3 cup sugar
• 2 teaspoons baking powder
• 1/4 teaspoon salt
• 1/2 teaspoon cinnamon
• 1 cup fresh blueberries
• 3/4 cup milk
• 1/4 cup vegetable oil
• 1 large egg
• 1/4 cup sour cream
  
• 1 teaspoon grated lemon rind
• 1 teaspoon grated orange rind
• 1 teaspoon vanilla extract
• Cooking spray

Preheat oven to 400°. Combine first 6 ingredients in a medium bowl. Make a well in center of flour mixture. Combine milk and next 5 ingredients; add to flour mixture, stirring just until dry ingredients are moistened. Add blueberries and stir just until blueberries are mixed in. Use a 1/4 cup measure to pour batter into muffin tin coated with cooking spray. Fill each muffin cup 2/3 full. Bake for 20 to 25 minutes until golden. Remove muffins to wire racks to cool. Makes 12 muffins.