1 teaspoon vanilla bean paste or pure vanilla extract
Preheat the oven to 350°F and line two baking trays with parchment paper.
For the cookies, beat the butter and brown sugar together by hand until well blended and almost fluffy, about a minute. Beat in the egg, followed by the vanilla.
Sift in the flour, baking soda, baking powder, cinnamon, nutmeg and salt and stir until evenly combined. Stir in the carrots, followed by the oats and coconut. Stir in the currants.
Use a small ice cream scoop to drop levelled amounts of the batter onto the baking trays, five centimeters apart. It’s important to drop level scoops so that the cookies bake with nice domed tops.
Bake the cookies for about 12 minutes, until they lift easily from the tray. Cool on the trays on wire racks.
For the filling, beat the cream cheese and butter by hand until smooth. Add the icing sugar and vanilla and beat again until fluffy and well blended.
To assemble the sandwiches, spoon the filling into a piping bag fitted with a large plain piping tip and pipe a layer of filling over the flat side of a cookie (or use a spatula to spread a generous dollop of the filling instead). Press a second cookie, flat side down, on top of the filling.