Gluten Free Gingerbread House

Name: Gluten Free Gingerbread House
Prep time: 40 min
Cook time: 45 min
Total time: 1 h 25 min
Cuisine: British
Ingredients: 360 g unsalted hard block butter/dairy free BLOCK alternative (softened); 200 g soft light brown sugar; 80 g molasses (black liquid treacle); 1 tsp vanilla extract; 2 large eggs (At room temperature - UK large (Canadian ‘Extra Large’; Australian ‘Jumbo’; and US ‘Extra or Very Large’)); 500 g plain gluten free flour mix (eg Gluten Free Alchemist blend A (see NOTES)); 2 tsp xanthan gum; 1 tsp bicarbonate of soda; 2 tbsp ground ginger powder (or less if you prefer less ginger (min 4 tsp)); 2 tsp ground cinnamon; ½ tsp fine sea salt; 200 g icing sugar (powdered/confectioners sugar) (May need a little more, dependent on the size of egg white); ½ tsp cream of tartar; 1 large egg white (approx 40g); sweets, edible glitter, writing icing, sprinkles