01 - Set oven to 350°F. Line baking sheets with parchment paper to prevent sticking.
02 - Whisk together flour, baking soda, ginger, cinnamon, cloves, and salt in a medium bowl until evenly mixed.
03 - In a large bowl, beat softened butter and brown sugar using an electric mixer until mixture is light and fluffy.
04 - Add molasses and large egg to the butter mixture, mixing thoroughly until fully combined.
05 - Gradually add dry ingredients to wet mixture, stirring to form a consistent dough. Divide dough in half, wrap with plastic wrap, and refrigerate for 30 minutes.
06 - Roll chilled dough to a thickness of 1/5 inch. Using cardboard templates, cut out house components including walls, roof panels, door, and chimney. Arrange shapes on prepared baking sheets.
07 - Bake for 12 to 15 minutes until edges are firm but not browned. Remove from oven and cool completely on wire racks.
08 - Beat egg whites in a large bowl until frothy. Gradually sift in powdered sugar and add lemon juice, beating continuously until stiff peaks form. Transfer icing to piping bags.
09 - Pipe royal icing along edges of house components to join pieces. Hold sections in place briefly to secure. Allow assembled structure to dry undisturbed for 30 minutes to ensure stability.
10 - Attach gumdrops, mini chocolates, crushed candy canes, jelly beans, sugar pearls, licorice laces, and peppermint rounds to the house using royal icing as adhesive. Add decorative details such as windows, doors, and roof tiles. Allow decorations to set completely before display or serving.