Preheat oven to 350 Fahrenheit

Mix together the bananas, brown sugar, butter, eggs OR applesauce, sour cream and vanilla in a bowl

In another bowl, mix together the flour, baking soda, cornstarch and salt

Slowly incorporate the dry mixture into the wet mixture, stir well

In another bowl again, mix together all of the cinnamon paste ingredients: Butter, brown sugar, cinnamon, cornstarch and heavy cream

Line a loaf pan with parchment paper

Add half of the batter to the pan, and layer with half of the cinnamon paste. Swirl it into the layer of batter, do not stir. Layer with the other half of batter and the rest of the cinnamon paste

While the loaf bakes in the oven for 55-60 minutes, make the icing in another bowl, set aside

Allow the loaf to completely cool before icing

Slice and enjoy!