Preheat oven to 325℉ and prepare a muffin tray with liners or by greasing it.
In a large mixing bowl, combine mashed bananas, pumpkin puree, oil, eggs and vanilla extract. Mix thoroughly.
In a separate mixing bowl, combine flour, sugar, baking powder, baking soda, cinnamon and salt.
Add the dry ingredients to the wet ingredients and stir in the chocolate chips. Mix well.
Pour the batter into the muffin tins. Bake for 22-25 minutes or until an inserted toothpick comes out clean.
Let muffins cool for 5-10 minutes before enjoying!