Mix flour, salt, sugar, baking powder with a whisk. In a separate bowl mix the milk, eggs and vanilla. Mix the wet and dry together, then add in the melted butter. Mix until well combined.
Use some baking spray to spray a rectangular cake pan, 9×13, then pour the batter evenly into the pan.
Mix brown sugar and cinnamon together and spread evenly on the cake. Use a knife or fork to swirl the sugar and cinnamon into the batter.
Bake for 30 minutes, let cool completely.
Mix the powdered sugar, 1 tsp vanilla and water until it is a consistency like pancake syrup.
Pour over the cake and it will set into a harder glaze.
