In a large bowl, whisk together the flour, granulated sugar, brown sugar, baking powder, baking soda, and salt
In another bowl, whisk together the melted butter, buttermilk, eggs, and vanilla extract.
Pour the wet mixture into the bowl of dry ingredients. Gently stir with a spatula until just combined
Fold in the chocolate chips at the end.
Line a 12-cup muffin tin with paper liners or lightly grease it.
Divide the batter evenly among the cups, filling each about three-quarters full.
Bake for 18–22 minutes, or until a toothpick inserted in the center comes out clean
