In a large bowl, whisk the melted butter, brown sugar, molasses, salt, cinnamon, ginger, and allspice until smooth.
2. Step
Whisk in the egg until combined.
3. Step
Fold in the baking powder, baking soda, and half of the flour.
4. Step
Add the rest of the flour until dough comes together.
5. Step
Wrap in plastic wrap and chill in the refrigerator for 30 minutes.
6. Step
Preheat oven to 350°F (180°C).
7. Step
Roll out the dough to ¼-inch (6 mm) thickness. Cut into the desired shape using small knife.
8. Step
Take the extra dough and roll out again to ¼-inch (6 mm) thickness. Continue to cut shapes until dough is used. If dough gets too soft, transfer to fridge before rolling out.
9. Step
Transfer shapes to a parchment paper-lined baking sheet and bake for 8-10 minutes.
10. Step
Carefully transfer the cookies to a baking rack and cool completely.
11. Step
Equally divide the powdered sugar in three bowls.
12. Step
Add two tablespoons of milk to each and whisk until smooth. If too runny add more powdered sugar, if too thick add more milk.
13. Step
Add red food coloring to one bowl and green to the other.
14. Step
Transfer icings to three different piping bags with a thin tip.
15. Step
Decorate the cookies and allow to set before assembling.
16. Step
Fit the cookie pieces into each other to allow the cookies to stand.
