Vanilla Kifli -- a Vanilla Cookie (Hungary) – Recipe Wise

Ingredients

• 3/4 cup unsalted butter , room temperature
• 1/2 cup granulated sugar
• 1 teaspoon vanilla extract
• 2 egg yolks
• 2 cups all-purpose flour
• 1/2 cup vanilla sugar
• 2 semi-sweet chocolate baking squares , chopped