Preheat the oven to 375 degrees F. Line 12 muffin cups with paper liners. Set pan aside.

In a large bowl whisk together flour, sugars, baking powder, and salt.

In medium bowl stir together melted butter,  eggs, buttermilk, and vanilla extract until well blended. Make a well in the center of the dry ingredients. Pour the liquid mixture into the well and gently stir until combined. Stir in chocolate chips.

Spoon batter into muffins cups. Bake for 17-20 minutes or until a toothpick comes out clean. Remove muffins from the oven and allow to cool before serving.