Ingredients

• ½ cup white sugar
• 2 ½ tablespoons butter, at room temperature
• 2 large egg yolks
• 2 ¼ cups all-purpose flour
• 1 ½ teaspoons baking powder
• 1 teaspoon salt
• ½ cup sour cream
• ⅓ cup white sugar
• 1 teaspoon cinnamon
• 2 tablespoons butter, melted, or as needed