Start with your dry ingredients. Add the flour, sugar, baking powder, baking soda, and salt to a bowl and whisk together until fully combined.
Set that aside and make your wet batter by combining the buttermilk, milk, melted unsalted butter, vanilla, and egg in a separate bowl and whisk until smooth.
Slowly pour the wet ingredients into the dry mixture and fold everything together gently. Do not over mix this batter.
Let the batter rest for 5 to 10 minutes.
Preheat your skillet to medium low.
Add a little oil and butter to the pan and let it melt together.
Pour your batter into the pan and let it cook undisturbed.
Watch for small air bubbles beginning to form across the surface of the pancake. That is your cue to flip.
Once you flip, do not press the pancake down.
Let it cook until the bottom is also crispy then remove from the pan.
Immediately add a pat of butter on top as soon as it comes off the heat and let it melt right in.
