Allow butter to come to room temperature.
Cream ½ cup butter and sugar together.
Add ½ cup molasses and 1 egg. Mix until combined.
In a separate bowl add 3 cups flour.
Add 1 ½ tsp. allspice, 2 tsp. ginger, 1 tsp. cinnamon, 1 tsp baking soda and a pinch of salt. Combine.
Add dry ingredients to wet and mix until combined.
Divide in half.
Between two pieces of parchment paper, roll dough to approximately ¼ inch thickness.
Stack each in their own parchment paper in the refrigerator, and allow to chill completely flat for 30-40 minutes.
Draw and cut out the template for the gingerbread house.
Using a pizza cutter, cut your dough into shapes.
Place on lined baking tray and bake at 350° for 14-16 minutes.
Allow to cool completely.