Preheat your oven to 350℉. Line a muffin tin with cupcake liners and lightly grease them with nonstick spray.
In a medium sized bowl, mash the bananas completely until no lumps remain.
3 bananas
Add in the vegetable oil, brown sugar, eggs, sourdough discard, and vanilla extract. Whisk all of the ingredients together until they are well combined.
½ c vegetable oil, ¾ c brown sugar, 2 eggs, ¾ c sourdough discard, 2 teaspoon vanilla extract
Add the flour, baking powder, baking soda, cinnamon, nutmeg and salt. Whisk again until just combined.
2 c all-purpose flour, 2 teaspoon baking powder, 1 teaspoon baking soda, 1 tablespoon cinnamon, ½ teaspoon nutmeg, ½ teaspoon salt
Fill the muffin tin cups about ¾ full and place in the oven to bake for 18-20 minutes or until a toothpick inserted into the center comes out clean. Allow to cool slightly before transferring to a cooling rack.