Italian Hazelnut Cookies with Nutella® hazelnut spread

Instructions

• In a large bowl, mix together hazelnuts, flour and sugar. Mix in butter, egg yolk and salt until combined. Form into ball; wrap in plastic wrap. Refrigerate for 3 hours.
• Preheat oven to 300 degrees F. Roll dough into 48 small balls, about 2 tsp each. Arrange balls, about 2 inches apart, on parchment paper-lined baking sheets.
• Bake, in batches, for about 18 minutes or until just set and lightly golden brown. Let cool completely on cooling rack.
• Spread or pipe 1 tsp Nutella® hazelnut spread over the bottoms of half of the cookies. Sandwich with remaining cookies.