In a large bowl, combine flour, sugar, baking powder, and salt. Whisk until evenly mixed.
In a separate bowl, whisk milk, egg, melted butter, and vanilla.
Slowly pour the wet mixture into the dry ingredients and mix gently. A few small lumps are fine. Overmixing will make the pancakes dense.
Fold in the blueberries right before cooking.
Preheat a skillet or griddle over medium heat and lightly grease it.
Scoop about 1/4 cup of batter for each pancake onto the hot surface.
Cook until bubbles form on the surface and the edges set. Flip and cook the other side until golden brown.
Serve warm with butter, maple syrup, or even a dusting of powdered sugar if you’re feeling fancy.