I also process very ripe bananas by themselves and create a smooth, creamy mixture, which I use instead of sugar in recipes including pumpkin pie. Since granulated sugar turns into a liquid on baking,
adding the banana mixture does not add much liquid to a recipe, but I generally count the banana mixture both as a sugar and as a liquid, lowering another liquid in the recipe.
Cranberry relish sweetened only with banana
If the bananas are small, I will use two bananas, as the recipe is not sweet enough for us unless the banana is a very ripe, large banana.
When I have extra ripe bananas, I process a few to form a sweet, creamy liquid which I substitute for granulated sugar in many recipes.