In a medium bowl, whisk together one large egg, 1 cup of buttermilk, 1/2 cup of sour cream, and 2 tablespoons of melted unsalted butter until smooth.

In another bowl, mix together 1 cup of all-purpose flour, 1 tablespoon of baking powder, 1/2 teaspoon of baking soda, 1/4 teaspoon of salt, and 2 tablespoons of sugar.

Gently fold the dry ingredients into the wet mixture using a spatula until just combined.

Preheat your griddle to 350°F and add a little melted butter once it's hot.

Scoop about 1/3 cup of batter onto the prepared griddle for each pancake. Cook for about 2-3 minutes until bubbles form.

Carefully flip the pancakes using a spatula and cook for an additional 2-3 minutes until golden brown.

Remove the pancakes from the griddle and serve immediately while warm.