Line a muffin tray with cupcake liners.Preheat the oven to 350°F.
Get all the ingredients ready.
Mash the bananas nicely in a large bowl.
Add the melted butter to the bananas and mix well.
Add in the sugar, egg, coffee and vanilla extract and mix well.
Whisk together the flour, baking soda, and salt.
Add the flour mixture to the banana mixture a third at a time.
Stir until incorporated. Take care not to over-mix ,otherwise you will end up with dense and hard muffins.
Fold in the chopped walnuts or pecans or chocolate chips . You can add whatever you like.
Spoon the mixture into the muffin tray.
Bake at 350°F for 20-25 minutes.
Check if it is done by pressing on the muffin. If it bounces back , it's done. You can also check by inserting a skewer into the center of a muffin and checking if it comes out clean.
Cool on a rack.
Muffins are ready to be enjoyed!
Notes
Adding a hint of coffee powder enhances the taste of the muffins, but it is optional.
Use overripe bananas for great-tasting muffins.
Do not overbake muffins and take them out of the oven at the right time.
Add mix-ins like chocolate chip cookies, toasted walnuts, or any other favorites.