Add the buttermilk mixture to the flour, and mix until just combined, be careful not to over mix.
Fold in 1 cup chocolate chips.
1 1/2 cups semi-sweet chocolate chips
Fill muffin tins about 3/4's full. Top the muffin batter with the remaining chocolate chips.
Bake for 5 minutes, reduce heat to 350º F (do not open the door) and bake for 12-14 more minutes, until they are golden brown and a tester comes out clean.
Remove from the oven and cool for 5 minutes before removing to a wire rack to cool completely.