Chocolate Hazelnut Thumbprint Cookies

Bahan-bahan (26 porsi)

• ½ cup butter (room temperature)
• 1 egg (room temperature)
• ½ teaspoon vanilla extract
• 1 cup powdered sugar
• 1 cup all-purpose flour
• ⅓ cup unsweetened baking cocoa
• ¼ teaspoon salt
• ⅔ cup toasted hazelnuts (finely chopped)
• ⅔ cup chocolate hazelnut spread