Pre-heat oven to 350F
Grease a 6” round cake pan
Mix flour, salt, baking powder, cinnamon, and cardamom in a medium mixing bowl and set aside.
Cream butter, vanilla, and sugar on high for 5 minutes until light and fluffy
Add the egg and beat until combined
On low, mix in the pumpkin puree
Add the dry ingredients, mixing on low until nearly combined - there should still be white spots in the batter
Pour in the milk and mix until incorporated
Pour the batter in the prepared cake pan and bake for 28-30 minutes
Check to see if the cake is done by poking it with a skewer, it should come out clean
Let it cool for 10 minutes in the pan, then cool on a wire rack
Once cooled, combine 2tbsp sugar with ½ tsp cinnamon in a small bowl and set aside. Melt the additional butter and brush this over the cake. Quickly sprinkle with the cinnamon sugar mixture