Preheat your oven to 350℉.
In a mixing bowl, combine the buttermilk, melted butter, light brown sugar, granulated sugar, vanilla extract, and eggs. Whisk until smooth.
Add the flour, baking soda, salt, and spices (cinnamon, nutmeg, cloves, and allspice) to the bowl with the wet ingredients. Whisk until just combined.
Pour the cake batter into a prepared cake pan (8-inches either square or round) and smooth into a flat layer.
Bake at 350 for 35-40 minutes until a toothpick or cake tester inserted into the center of the cake comes out with just a few crumbs. Remove it from the oven and let it cool for 10 minutes in the pan then transfer it to a wire rack to cool completely.
While the cake cools, using an electric mixer (either stand mixer with a paddle attachment or a hand mixer) cream the butter on medium speed for 2 minutes until it's whipped to be light and fluffy. Then on low speed add the powdered sugar and mix until well combined, another 1-2 minutes. Then finally whip in the maple, vanilla, and a pinch of salt.
Scoop the frosting on top of the cooled cake, and spread evenly over top.