Whisk together the egg whites and buttermilk in a bowl. In a separate bowl, whisk together the egg yolks and the melted butter.
Combine the buttermilk mixture with the egg yolk mixture in a large bowl and whisk until well combined. Add the pancake mix and whisk gently until just combined. Don't over mix, lumps are ok.
To make the pancakes, heat a griddle or pan over medium heat, add a small amount of butter. Once hot, pour some pancake batter on top. Cook on one side until set and golden brown, then flip and repeat with the other side.