Preheat oven to 425 degrees
In a medium bowl whisk together flour, baking powder, soda and salt, set aside.
In another bowl whisk together sugar, butter, vanilla, eggs, sour cream and buttermilk until combined.
Add in the dry mixture and mix until combined. Then fold in chocolate chips.
Fill your muffin tins to the very top, sprinkle a few chocolate chips on top and a pinch of coarse sugar if desired.
Bake at 425 degrees for 5 minutes, then reduce heat to 375 degrees and bake another 13- 15 minutes.
Remove muffins from oven and let cool, store in an airtight container for 3 days
**To make your own buttermilk add 1 teaspoon lemon juice or distilled vinegar to 1/2 cup milk. Let set for 5 minutes to sour.