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

In another bowl, combine the beaten egg, buttermilk, melted butter, cake mix, and vanilla extract.

Pour the wet ingredients into the dry ingredients and mix until just combined.

Heat a non-stick skillet over medium heat and grease lightly.

Pour 1/4 cup of batter onto the skillet for each pancake and cook until bubbles form on the surface.

Flip the pancakes and cook for an additional 1-2 minutes until golden brown.

Remove from skillet and let cool on a wire rack.