Preheat the oven to 325 degrees. Line baking sheet with parchment paper or silicon mat.
Peel and cut the bananas in half lengthwise.
Place the bananas on baking sheet and roast for 12 minutes or until they just start to turn brown.
Let cool slightly.
Transfer the bananas and cinnamon to a blender or food processor and puree for 1-2 minutes or until smooth, adding liquid in 1/4 cup increments until you reach your desired consistency.