Preheat your oven to 350°F (175°C). Line a baking sheet with parchment paper.

In a large mixing bowl, cream together the softened unsalted butter and brown sugar until light and fluffy. Add in the large egg and molasses.

In a separate bowl, whisk together the flour, ground ginger, ground cinnamon, baking soda, and salt. Gradually add this to the wet ingredients until a soft dough forms.

Roll out the dough to about ¼ inch thickness. Cut out shapes for the walls and roof of your gingerbread house.

Bake the gingerbread pieces for 12-15 minutes. Let them cool completely on a wire rack.

Assemble your house using royal icing as glue to attach the walls, then add the roof.

Decorate your house with royal icing and assorted candies, sprinkles, and other textures.

Let the decorations set for at least 30 minutes before serving.