Preheat the oven to 350°F (177°C) and lightly grease a 10-ounce ramekin.
In a small bowl, combine flour, baking soda, cinnamon, and salt. Mix them together and set the bowl aside.
Mash the banana with a fork.
Transfer the mashed banana to a medium-sized bowl and add the sugar. Use an electric mixer or a wire whisk to thoroughly whip the banana and sugar together.
Add the melted butter, egg yolk, and vanilla to the banana-sugar mixture. Mix everything together until it’s well combined.
Pour the dry ingredients into the bowl with the banana mixture and mix until all the ingredients are fully combined.
Fold in the chocolate chips.
Next, pour the batter into the prepared ramekin. Place the ramekin on a rimmed baking sheet to catch any possible spills.
Bake in the preheated oven for 25-30 minutes, or until the top is a beautiful golden brown. Remove the ramekin from the oven and allow it to cool slightly before enjoying!
Notes
Use Ripe Bananas: For the best flavor and sweetness, use ripe bananas with brown speckles on the skin. They will mash easily and infuse your banana bread with a rich, natural sweetness.
Properly Measure Flour: To ensure your banana bread has the right texture, measure the flour accurately. Use a spoon to fill the measuring cup with flour, then level it off with a flat edge. Avoid packing the flour into the cup.
Grease the Ramekin Well: Ensure that your ramekin is generously greased to prevent sticking.
Precise Baking Time: Keep a close eye on the banana bread as it bakes. Oven temperatures can vary, so it’s important to follow the suggested baking time and check for doneness with a toothpick. Insert it into the center; if it comes out clean or with a few moist crumbs, the bread is done.