Begin by preheating the oven to 180 degrees and preparing a muffin tin with 12 paper cases.
In a bowl, take the softened but still pliable butter, and combine it with the sugar. Using an electric whisk, blend until you achieve a consistent mixture. Then, gradually add one egg at a time while continuing to whisk, ensuring thorough incorporation. Introduce the baking powder into the mixture, all while keeping the whisk in motion.
If you plan to add nuts or chocolate chips, gently fold them into the batter at this point. Keep in mind that the batter will have a thick consistency.
In a separate large bowl or in the bowl of your stand mixer, mash the bananas. Then, at medium speed, add the bananas to the muffin mixture and continue to beat or whisk until they are well combined
Sift the flour directly into the bowl together with the baking powder. Then, combine these dry ingredients into the mixture, ensuring a thorough blend with the electric hand mixer.
Using a spoon, carefully distribute the batter into the prepared paper cases. Place the tin in the oven and bake for approximately 25 minutes until the muffins are beautifully risen and have a golden hue. Once done, remove the cases from the tin and set them aside to cool.
If desired, you have the option to enhance the muffins by drizzling melted chocolate over them. You can achieve this by either using a teaspoon or a piping bag.