In a small bowl, whisk buttermilk, egg, melted butter, and vanilla extract.
Whisk in flour, baking powder, sugar, and salt. Whisk until smooth. Fold in blueberries.
Preheat a cooking pan over medium heat. Add a little oil to the pan.
You can make one or two pancakes.
Cook the pancakes, in the preheated pan, for a couple of minutes on each side. Check the pancakes by pressing lightly in the center, if it's firm the pancakes are done.
Notes
Size option: This batter can be cooked as one larger pancake (pour it all in) or two smaller pancakes (split into two dollops).
Batter consistency: The batter should be pourable but thick. If it looks too thick, add a small splash of buttermilk; if it seems thin, whisk in a little extra flour.
Mix-ins: Blueberries are optional, or other add-ins (chips, nuts, zest), keep the amount small so the pancakes still cook through evenly.
Gluten free option: you can use all purpose gluten free flour instead of regular flour. (Personally, I prefer the 1:1 baking all purpose gluten free flour either from Bob’s Red Mill or King Arthur.) Please do remember that the texture will be different.