Applesauce, avocado, ground and cooked oatmeal, cooked mashed sweet potatoes or pumpkin, or Greek yogurt or ripe plantains can be substituted for mashed banana in some baking recipes. Substitute ½ cup for each banana.
You may need to add sugar or honey to mimic the banana’s sweetness, and banana extract to get banana flavor.
Greek yogurt, mango, or cooked oatmeal can replace bananas in smoothies. You can replace eggs, butter and oil in baking recipes with mashed banana. Use the same volume of banana as the original ingredient calls for.
Any of these substitutions may change the texture of the final product.