Incredibly moist, soft and tender, deeply chocolatey banana muffins that will make your eyes roll back! These muffins are so delicious and full of chocolate flavor, not too sweet and even maybe a tiny bit healthy. Remember the chocolate cake from Matilda movie? Well, these can rival that cake!
In a medium bowl, soft together flour, cocoa powder baking powder, baking soda, espresso powder and salt. Whisk to blend evenly.
Mash the bananas with a fork on a flat surface (like a clean cutting board or a plate) until very smooth. Add it to a large mixing bowl. Add both sugars, sour cream, oil and vanilla and whisk until combined. Whisk in eggs until smooth. Add dry ingredients all at once and fold it all in gently with a spatula until just combined and a few streaks of flour remain, then gently fold in chocolate chips. Do not over-mix.
Divide batter evenly among prepared muffin cups, filling them to the rim. Add a few extra chunks of chocolate on top and bake for 15-18 minutes, until puffed, cracked and firm to the touch. A skewer inserted into the centers should come out clean.
Transfer pan to a wire rack and let muffins cool for 5 minutes before transferring individually to the rack to finish cooling. Enjoy warm with a tall glass of cold milk!