Preheat the oven to 400 F [or 180 degrees Celsius in a FAN oven, Gas Mark 6, or 200 degrees Celsius in a static oven].

Melt the butter in the microwave or bain-marie. Do not overheat it or allow it warm up.

Add the four peeled and chopped bananas, brown sugar, and melted butter to the food processor. Blend the wet ingredients until you obtain a smooth cream with barely any bits of banana left.

Next, add the eggs and blend until fully incorporated. From now on, everything that is added to the processor should be blended just until incorporated, not longer than that.

In a separate bowl, sieve the all purpose flour, baking soda, and baking powder, and mix with the salt.

Start adding the dry ingredients to the banana batter 3-4 tablespoons at the time, and blend until incorporated, but don't overmix. Rather than a continuous blending action, it is best to incorporate the flour mix with short pulses.

Continue doing so until you are left with only a tespoon of flour.

To the remaining teaspoon of dry ingredients, add the chocolate chips and mix them well.

Finally, add the chocolate chips to the batter, and mix it using a spatula or spoon. If possible and easier, remove the blender blades.

Now, prepare the muffin tin. To the bottom of each muffin hole, add a few grains of raw rice; these will help capture the moisture that usually settles at the bottom of the muffins. On top of the raw rice, add the muffin liners.

Fill the liners with the muffin batter about two-thirds of the way. This muffin recipe will make 12 regular sized muffins.

Bake the banana chocolate chip muffins on the middle shelf of the oven for 17 minutes, or until thoroughly cooked. Test they are baked thoroughly by pressing the top gently [if the sponge springs back it's done], or by inserting a clean toothpick into the center of a muffin - if it comes out clean or with a few moist crumbs, they are done.

Once ready, remove the muffin pan from the oven and place it on a cooling rack for 5 to 10 minutes to cool slightly.

Finally, remove the banana chocolate chip muffins from the tin and enjoy with a cup of tea or coffee, or with a nice scoop of ice cream or a little whipped cream!