Step 1

Preheat your oven to 425F degrees and butter or line a 12 cavity muffin tin.

Step 2

In a medium bowl, whisk together the flour, baking soda, baking powder and salt.

Step 3

Beat the butter and sugar together until light and fluffy - about 2 minutes. Add in the eggs and vanilla and continue mixing until combined.

Step 4

Turn off your mixer, scrape down the sides & fold in the sour cream and buttermilk.

Step 5

Carefully fold in the flour mixture until almost combined. Then stir in the chocolate chips.

Step 6

Fill your muffin tins to the very top (about a generous 1/3 cup). Optionally sprinkle with a few extra chocolate chips and coarse sugar.

Step 7

Then bake at 425F degrees for 5 minutes. Turn down the oven to 375F degrees and continue baking for 13-15 minutes.

Step 8

Allow muffins to cool in the pan for 5 minutes, then continue cooling on a wire rack.