FROZEN YOGURT COOKIE SANDWICHES

For the Cookies: 230g (2 sticks) unsalted butter, at room temperature300g Dark Brown Sugar1 egg, at room temperature1 tsp vanilla bean paste300g (2 cups) all-purpose flour½ tsp baking soda1 tsp saltPreheat the oven to 350˚f / 180˚c. Line three baking sheets with parchment paper. To make the cookies, cream the butter and brown sugar in the bowl of a stand mixer fitted with the paddle attachment until light and fluffy, approximately 5 minutes. Add the egg and vanilla and mix well. Sift together the flour, baking soda and salt, and add to the mixer, mixing on low until combined. Scrape...