Pour the light brown sugar and granulated sugar into the cooled butter and whisk together.
½ cup light brown sugar, ½ cup granulated sugar
Whisk in the eggs, mashed bananas, sour cream, and vanilla extract.
1 ½ cups mashed bananas, 2 large eggs, ⅓ cup sour cream, 1 teaspoon vanilla extract
Pour the dry ingredients in and use a rubber spatula to fold together until just combined.
Stir in the chocolate chips, but keep a few to the side.
1 cup chocolate chips
Pour the banana muffin batter into your prepared liners to the top then sprinkle over the extra chocolate chips.
Bake in the preheated oven for 5 minutes, then lower the temperature (without opening the door) to 350/175 and bake for an extra 20-25 minutes.
Let the muffins cool in the pan for 10 minutes before removing to a wire cooling rack to cool completely.
Video
Notes
My recipes have been developed and tested in metric grams. I highly recommend using a weighing scale and measuring out your ingredients the metric way. I make sure that all of my ingredients are at room temperature before I start the recipe, so pull out all of the ingredients about 2 hours before you start baking.Salt: If you don't have kosher salt, halve the amount of salt called for in the recipe. 1 teaspoon kosher salt = ½ teaspoon fine salt. I'm using Diamond Crystal Kosher Salt and not Morton Salt which is too salty for this! Sour Cream: if you don't have sour cream, use full-fat yogurt or Greek yogurt. Storage: keep in an airtight container at room temperature for 2 days, or in the fridge for five days. Freezing: freeze baked and cooled muffins in a freezer bag. Let them thaw in the fridge or at room temperature.