Prepare the Batter: In a large bowl, whisk together the gluten-free flour, sugar, baking powder, baking soda, and salt.
Combine Wet Ingredients: In another bowl, whisk together the buttermilk, egg, melted butter, and vanilla extract.
Mix Together: Pour the wet ingredients into the dry ingredients and stir until just combined.
Cook the Pancakes: Heat a non-stick skillet over medium heat. Pour 1/4 cup of batter onto the skillet for each pancake. Cook until bubbles form on the surface, then flip and cook until golden brown.