Special equipment: tree-shaped cookie cutters (we used 4-inch, 6-inch and 8-inch cutters); 2 pastry bags; 2 small no. 4 round tips
For the dough: Whisk together the flour, baking soda and salt in a medium bowl. Beat together the vanilla and 2 eggs in a small bowl.
Beat the butter, granulated sugar and confectioners' sugar in a large bowl with an electric mixer on low speed. Once they are incorporated, increase the speed to medium and, scraping down the sides of the bowl as needed, beat until slightly creamy, about 3 minutes.
Reduce the speed to low, slowly pour in the egg mixture and beat until combined. Add the flour mixture in 3 additions, increasing the speed as the dough gets thicker to keep the beaters spinning and scraping down the sides of the bowl and the beaters as needed. Once all the flour is just incorporated, increase the speed to medium-high and beat until the dough is very smooth, about 5 minutes.
Turn the dough out of the bowl and bring it together on a clean surface. Divide into 2 pieces. Shape each piece into a flat square and wrap in plastic. Refrigerate for at least 3 hours or up to overnight.
To cut and bake the forest: Position racks in the upper and lower thirds of the oven and preheat to 350 degrees F. Line 3 baking sheets with parchment.
Dust your work surface with flour and roll out a piece of dough until about 1/4-inch thick. Keep the other piece refrigerated while you work. Punch out shapes in the dough with tree cookie cutters of various sizes and cut off the dough trunks; for every 3D tree you will need 2 tree cutouts of the same size so punch out the shapes in pairs. For our forest we used 4-inch, 6-inch and 8-inch cutters. Put the trees on the prepared baking sheets and chill while you roll and cut trees from the remaining dough. Combine the scraps of the 2 squares. Chill again, reroll and cut out more trees You should have 8 to 10 pairs of trees, depending on the size of your cutters. Freeze the cutout cookies for at least 30 minutes.
Rearrange the cookies on the baking sheets so that the pairs are next to each other. For the first cookie of each pair, use a sharp paring knife to cut a 1/2-inch-wide slot from the bottom to a little more than halfway up the cookie. For the second cookie of each pair, cut a similar slot but from the top of the tree down to a little past the middle. You will fit the cookies together with these slots after they are baked. Return the cookies to the freezer for 30 minutes more.
Whisk together the remaining egg with 2 tablespoons water in a small bowl. Brush a thin layer of egg wash on the cookies right before baking.
Bake the cookies, rotating the baking sheets front to back and bottom to top about halfway through, until golden brown and dry on top, 15 to 18 minutes. Let cool completely on the baking sheets set on a cooling rack, about 30 minutes.
Meanwhile, make the royal icing: Combine the confectioners' sugar, meringue powder and vanilla in a large bowl. Add 5 tablespoons water and beat with an electric mixer on medium-high speed until the icing forms thick and glossy peaks, about 2 minutes, adding up to 1 tablespoon more water, if needed.
Remove a third of the royal icing and place it in a pastry bag fitted with a small no. 4 round tip. Color the remaining icing with the green food coloring, one drop at a time, until it's a shade you like. If the frosting is still very stiff, add 1 to 2 teaspoons of water. Fill a second pastry bag fitted with another small no. 4 round tip with the green frosting.
Use a sharp paring knife to shave the cookie edges so they are smooth and flat: Pay attention to the tree bottoms (so the trees will stand straight) and the inner edges of the slots. Assemble the trees by sliding the top-slot trees into the bottom-slot trees. Shave the cookies as needed for a smooth fit, then disassemble them and place the pieces on a flat surface. Don't worry if a tree breaks; glue the pieces together with green royal icing.
To decorate the forest: Decorate each cookie with the green icing, leaving a blank strip up the center without icing; this is where the pieces will fit together. We used a zigzag line of green on each side. Sprinkle with white sprinkles while the icing is still wet. Let set
until firm, 30 to 45 minutes. Turn the cookies over and decorate the backs in the same fashion. Let set until firm, 30 to 45 minutes.
Assemble the trees. Pipe a thin line of white icing on the outer edges of the trees for snow. Let set before serving, 30 to 45 minutes. Arrange the trees on a serving platter to create a forest. Sprinkle with confectioners' sugar for snow.
When measuring flour, we spoon it into a dry measuring cup and level off excess. (Scooping directly from the bag compacts the flour, resulting in dry baked goods.) If you don't have tree-shaped cutters, you can make a stencil. Use a ruler to draw the outline of a tree on paper. Cut it out and use it as a guide for trimming the dough with a paring knife.
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