Take butter and sugar in a bowl and mix it till smooth.

Add eggs one by one and vanilla, mix well.

Sieve flour and baking powder together in a bowl and start pouring slowly in egg, butter and sugar mixture.

Fold the batter with soft hands.

Pour the batter in piping bag.

Set the muffin cups in baking tray. Pipe it with batter.

Bake it in preheated oven for 15-20 minutes or till toothpick comes out clear.

Take it out and let it cool.