01 - Set oven to 350°F and line two baking sheets with parchment paper.
02 - In a large bowl, whisk together flour, baking soda, salt, ground ginger, cinnamon, cloves, and nutmeg.
03 - In a separate bowl, beat softened butter and brown sugar until light and fluffy; add molasses and egg, then mix until combined.
04 - Gradually add the dry mixture to the wet, stirring until a stiff dough forms. Divide dough in half, wrap tightly, and chill for 30 minutes.
05 - On a floured surface, roll dough to 1/4 inch thickness. Using templates, cut out two walls, two roof panels, and two end walls with door and window shapes. Transfer to prepared baking sheets.
06 - Bake for 15 to 20 minutes, or until edges are firm to the touch. Cool completely on wire racks.
07 - Beat egg whites until frothy; add cream of tartar. Gradually add powdered sugar, beating until stiff peaks form. Tint portions if desired.
08 - Pipe a thick line of royal icing along the edges of walls. Press pieces together firmly and hold for several minutes until set. Repeat this step for roof panels. Let dry for at least 1 hour before decorating.
09 - Use royal icing to attach assorted candies, sprinkles, and shredded coconut to create snow effects for festive embellishment.