Ingredients
Makes about 2 1/2 dozen cookies
2/3 cup unsalted butter, softened
1/2 cup sugar
2 egg yolks
1/2 teaspoon salt
1 teaspoon vanilla
1 1/2 cups all-purpose flour
2 egg whites, lightly beaten
1 cup finely chopped hazelnuts
1/2 cup Nutella
Preparation
