INSTRUCTIONS:-
1. Preheat the oven to 350°F (180°C) and line 2 baking trays with parchment paper.
2. Using a stand mixer fitted with the paddle attachment or electric beaters, beat the butter and icing sugar until smooth.
3. Whisk the egg whites to loosen, then add half of the egg whites and vanilla to the butter mixture, beating well. Scrape down the sides of the bowl.
4. Add half of the flour, beat, and scrape the bowl well.
5. Add the remaining egg whites, beat well, then add the remaining flour and beat until smooth.
6. Spoon the batter into a large piping bag fitted with a medium plain tip and pipe the batter onto the parchment-lined baking trays.
7. Bake for about 10 minutes, until the cookies brown at the edges.
8. Cool the cookies on the parchment for a minute, then transfer them to a cooling rack to cool completely.
Serve and enjoy with tea or coffee!
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