Preheat the oven to 350°F. Grease and line a square baking pan with parchment paper. In a large bowl, whisk together the flour, baking soda, gingerbread spice, salt, and brown sugar. Set aside.
In a saucepan combine the butter, water, and molasses over medium heat. Bring to a simmer then remove from heat and pour into the flour mixture followed by the buttermilk, eggs, and vanilla.
Pour the batter into the prepared pan. Bake for 35 minutes or until cooked through and a toothpick inserted into the center comes out clean. Let cool completely.
Cream Cheese Frosting
While the cake is cooling, make the frosting by mixing together the softened cream cheese and vanilla bean seeds with a handheld mixer. Add in the powdered sugar and mix until fluffy.
Pipe or spread onto the cooled gingerbread cake and enjoy!
Notes
¼ teaspoon vanilla bean paste or ½ teaspoon vanilla extract can be substituted for the vanilla bean in the cream cheese frosting