Preheat the oven to 350 degrees F and prepare a muffin pan with non stick pan spray or coat with melted butter
In a medium bowl combine the flour, baking powder, baking soda and salt; set aside
In another bowl, whisk together the melted butter, light brown sugar, vanilla extract, eggs and sour cream until smooth and creamy
Add the dry ingredients to the wet ingredients and whisk until fully combined
Fold the mini chocolate chips into the muffin batter
Scoop the batter into the prepared muffin pans to fill completely (these will be large muffins, if you want smaller muffins only fill ¾ full and bake for less time)
Sprinkle the top of the muffins with a few extra mini chocolate chips and sugar in the raw
Bake the muffins for 18-20 minutes
Remove the muffins from the oven and allow to cool for 5 minutes
Enjoy the muffins warm!