Start by whisking together all of the dry ingredients - flour, sugar, baking powder, baking soda, salt, and mini chocolate chips.
Then mix in all of the wet ingredients including eggs, sour cream, vanilla, maple syrup, oil, butter, and buttermilk.
Let the batter rest at room temp for 1 hour. This gives the leaveners a head start, providing a tall muffin top once baked.