INSTRUCTIONS
Preheat the oven to 350
Combine the cake mix, eggs, oil, milk and vanilla in a mixing bowl.
In a separate bowl, mix the sugar and cinnamon together.
Spray pan with non-stick spray.
Mix the cake batter in layers and the sugar and cinnamon mixture. (I made 3 layers of cake batter and covered each layer tightly)
Place in the oven for 40 minutes.
In a small pan, melt the butter and add the brown sugar. Let it boil while cooking the cake until it gets darker and thicker.
Cool the cake until it is completely cold and pour the brown sugar over it.