Blueberry muffins

Here is my favorite muffin recipe when I have extra egg yolks leftover.

Makes 12 small or 6 large muffins.

• 6 tablespoons unsalted butter, room temperature, plus more for tins
• 3 cups plus 2 tablespoons all-purpose flour
• 3 teaspoons baking powder
• 1 teaspoon salt
• 1 1/4 cups sugar, plus more for sprinkling
• 1 large egg
• 2 large egg yolks
• 1 teaspoon pure vanilla extract
• 1 cup buttermilk
• 1 3/4 cups blueberries
• 1/2 cup chopped walnuts

Directions

1. Preheat the oven to 375 degrees. Butter large (3 3/4 inches) or small (2 3/4 inches) muffin tins, and set aside. In a large bowl, sift together flour, baking powder, and salt; set aside.
2. In the bowl of an electric mixer fitted with the paddle attachment, cream butter and sugar on medium speed until fluffy, about 3 minutes. Add egg, egg yolks, and vanilla; mix until well combined. Reduce speed to low; alternate adding reserved flour mixture and milk to mixer, beginning and ending with flour. Remove bowl from mixer; gently fold in berries and walnuts by hand. Divide batter among muffin tins; sprinkle generously with sugar. Bake until light golden, about 45 minutes for large muffins, about 30 minutes for small muffins. Cool in pan 15 minutes. Remove from pan; transfer to wire rack, and let cool completely.