Preheat oven to 350F. Generously grease and flour the 8-cup capacity shaped Bundt Cake pan and a 9 inch round cake pan. Set aside.
In a large bowl, mix together the flour, baking soda, and salt. Set aside.
In a large bowl, cream together the butter, brown sugar, and Granulated sugar until light and fluffy.
Add the flour mixture to the butter and sugar mixture until incorporated.
Combine the buttermilk, eggs and vanilla.
Mix the buttermilk mixture with the rest of the ingredients a bit at a time until fully combined (the batter will be quite thick).
Spoon ⅔ of the batter into the shaped bundt pan and ⅓ of the batter into the 9 inch round pan.
Bake the round cake for 20-25 minutes and the Christmas tree cake for 45-55 minutes, or until a cake tester comes out clean.
Cool in the pan for about 10 minutes, then invert onto a cooling rack (you want to glaze the Christmas tree cake while it's warm).
For The Sugar Glaze
In a small bowl, mix together the water, sugar, vanilla and food coloring to make the glaze to make the glaze.
Place some baking paper under the cooling rack the Christmas tree cake is on to catch any glaze that drips off the cake. The cake should still be warm. Glaze the tree section of the cake with the green glaze (you can use the glaze that drips off onto the paper beneath by scraping it onto a spoon). Leave to the cake to cool another 20-30 minutes to allow the glaze to set into a crispy coating.
For The Icing Glaze
In a mixing bowl, whisk together the powdered sugar, half the milk and vanilla extract. Add more milk as needed until it is the desired consistency.
Assembling The Cake
Trim the top of the round cake if necessary to flatten and the bottom of the Christmas tree cake to be flat enough to rest securely onto the round cake. Spread ¾ of the icing glaze over the cooled 9-inch round cake. Place the tree shaped cake onto iced the round cake.
Set a little of the icing glaze aside to use to attach your decoration and then use the remaining glaze to decorate the cake to look like snow.
Glue the stars or sugar shapes onto the finished cake using leftover icing glaze as glue. (I used tweezers to place my stars).