Mix the flour, sugar, baking powder, xanthan gum if using and salt in a bowl

Make a well in the flour and add the rest of the milk and the vinegar mixture, stirring until a smooth doughy batter is formed

Fold in the blueberries. It's okay if some break or mash while stirring. Let the dough stand a minute while you heat the oil in a frying over medium heat

Turn the heat down to medium low and drop in the dough by tablespoon, cooking for about 2 minutes per side, until lightly browned. Bubbles will start to pop on top when they're ready to turn. 3 at a time is plenty and it's a good idea to do a test one to make sure your oil is at the right temp and to adjust the cooking time so the middle is cooked through

When cooled, dust in powdered sugar or make a glaze from powdered sugar and a little milk. Yummy!