Preheat oven to 350°F. Line muffin tins with liners (recipe makes 12 muffins).
Measure the butter, then place in a medium sized microwave-safe bowl and heat until melted. Whisk in the eggs and vanilla.
Whisk in both sugars.
Mash the bananas with a fork to remove large clumps. Measure out 1½ cups of mashed banana and mix it in with the other liquid ingredients.
Add in the flour, salt, and baking soda, then whisk. Stir in chocolate chips (if using).
Add in the raspberries and give the batter a quick gentle stir (don't mix too much or the raspberries will break).
Divide the batter between the liners, filling each on 3/4 full. Bake in preheated oven for 18-22 minutes, or until a toothpick inserted in the middle of a muffin comes out clean.
After 5 minutes, transfer the muffins to a cooling rack. Enjoy!
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Notes
Flour: It is very important that you measure your flour properly! The right way to measure your flour is to weigh it using a kitchen scale, or use the scoop and level method.Chocolate Chips and Nuts: This is optional, so feel free to leave out the chocolate chips if desired. You can also optionally add sliced almonds!Mashed Banana: This recipe calls for exactly 1½ cups of mashed banana. Be sure to measure this quantity out, because if you use large bananas you could end up with more than 1½ cups.Storage and Freezing Instructions:Store in an airtight container at cool room temperature for up to 3 days. Freeze for up to 3 months by placing in a Ziploc bag. Thaw in the fridge or at room temperature.