
Pre-heat oven to 350F (180C) Line 2 cookie sheets with parchment paper.
In a large bowl beat the butter and sugar for approximately 5 minutes, until creamy.
Beat in the egg whites half at a time, then beat for 20-30 seconds. You don’t want to whip the whites until stiff. Add in the vanilla and flour beat for 30 seconds.
Add the batter to a pastry bag with a 2a round tip, pipe out 3 inch (8 cm) long strips approximately 2 inches (5cm) apart on the prepared cookie sheets.
Bake for 10 minutes until they start to turn golden around the edges. Let cool on the cookie sheet for approximately 10 minutes, then move to a wire rack to cool completely.