Step 1

Make the cookie: Line a baking sheet with parchment paper. Whisk the flour, ginger, cinnamon, allspice, nutmeg, salt and baking soda in a medium bowl.

Step 2

Beat the butter and granulated sugar in a large bowl with a mixer on medium-high speed until light and fluffy, about 3 minutes. Beat in the egg until just combined. Mix in the molasses and vanilla. Reduce the speed to medium low and beat in the flour mixture until just combined.

Step 3

Turn out the dough onto the baking sheet. With lightly floured hands, press the dough into a 10-inch round, about 1/2 inch thick. Lightly cover with plastic wrap and refrigerate at least 30 minutes.

Step 4

Preheat the oven to 350˚ F. Uncover the dough. Bake until the cookie is slightly puffed and golden around the edges, 18 to 20 minutes. Let cool 5 minutes on the pan, then slide the cookie (on the parchment) onto a rack to cool completely.

Step 5

Meanwhile, make the icing: Whisk the confectioners’ sugar and meringue powder in a large bowl. Add 4 tablespoons water and whisk until the mixture is smooth and stiff peaks form. Add more water, 1 teaspoon at a time, until the icing is thin enough to pipe.

Step 6

Transfer the icing to a piping bag with a small star tip. Pipe a snowflake design on the cookie. Sprinkle with granulated sugar and let the icing set, about 30 minutes. Cut the cookie into wedges.