To a sieve add flour,baking powder and salt,sieve it well for even mixing.

In a mixing bowl add sugar and Butter.Add vanilla essence and mix well until sugar completely dissolves.Add vinegar and baking powder it will bubble up.

Now add flour mixture and whisk it well.If the mixture was thick add a little milk.The mixture should be flowing not too runny or too thick.If you pour, it should spread by itself.Heat the sandwich maker,grease it with butter.Pour the batter into the holes in the sandwich maker.Close and cook covered for 4-5 minutes. slowly open and check if it's cooked it will stick.If it sticks then cook covered for another 2 minutes.