Recipe - Roz's Blueberry Muffin

Ingredients

• ½ cup butter, at room temperature
• 1 1/4 cup sugar
• 2 large eggs
• 2 teaspoons baking powder
• 1/2 teaspoon salt
• 1 teaspoon vanilla extract
• 2 cups all-purpose flour
• 1/2 cup milk
• 2 1/2 cups blueberries, fresh preferred
• 1/4 cup sugar, for topping (optional)