In a medium bowl, stir together flour, sugar, milk, oil, vanilla, and 1 teaspoon of the cinnamon. Stir until smooth. Spread batter into an 8x8 baking dish that has been sprayed with cooking spray or lightly greased.
In a small bowl, stir remaining cinnamon and brown sugar. Sprinkle this mixture over the top of your batter.
VERY SLOWLY pour the hot water over the batter by pouring it gently from a corner of the dish.
Bake at 350 for 40-45 minutes. Allow to cool a few minutes before serving. Top with whipped cream or ice cream, if desired.