Remove layers from freezer.
Grab your cake stand or serving dish and dollup a half dollar size of buttercream frosting onto the center.
Place one layer onto cake stand.
Spoon and smear a layer of Kahlua buttercream across the top. Slightly going over the edges.
Add top layer of cake.
Using an icing spatula or piping bag, cover sides with buttercream. Leave top of cake bare.
Use an offset spatula to smooth the sides of the cake.
Transfer remaining buttercream to piping bag with tip of choice. Begin to pipe trees.
Start in the center of cake and move outward.
Pipe a dollup of buttercream, then a second smaller dollop on the top to create a tree.
Sprinkle trees with cinnamon and powdered sugar.