Traditional Hungarian Apricot Kolaches

Ingredients

• 2 cups all-purpose flour
• ½ cup unsalted butter, softened
• ⅓ cup sugar
• 2 egg yolks
• ½ cup sour cream
• 1 teaspoon vanilla extract
• ¼ teaspoon salt
• ¾ cup apricot jam
• Powdered sugar, for dusting