Preheat the oven to 350 degrees. Spray a 9 x 13 baking pan with cooking spray and set aside.

In a large mixing bowl whisk together flour, ginger, cinnamon, baking soda, cloves, nutmeg, salt and brown sugar.

In a large saucepan, combine the butter, water, and molasses and heat on medium-high heat until butter is melted.

Bring the mixture to a slight boil.

Gradually whisk in the dry ingredients into the saucepan.

Remove from the stove and allow to cool for a few minutes.

Whisk in the buttermilk, eggs, and vanilla until combined.

Pour the batter into the baking dish.

Bake for 20-25 minutes or until a toothpick comes out clean.

Allow to cool.

Using a standing mixer, beat together the cream cheese, butter, powdered sugar, vanilla, heavy whipping cream, and 1 tablespoon of cinnamon. Mix until smooth.

Spread evenly over the top of the cake and sprinkle some additional cinnamon on top.