French Vanilla Cupcakes

Name: French Vanilla Cupcakes
Prep time: 10 min
Cook time: 20 min
Total time: 30 min
Cuisine: European, Mediterranean, French
Ingredients: 1 cup unsalted butter (room temperature); 2 cups vanilla sugar; 2 large eggs (room temperature); 2 egg yolks (room temperature); 3 cups all-purpose flour; 1 teaspoon baking powder; 1 teaspoon baking soda; Pinch of salt; 1 cup buttermilk (room temp); 2 teaspoons vanilla extract; 1 inch piece of vanilla bean; Frosting of choice