Preheat the cooker on stove top at medium flame for 10 min. Put the lid without whistle and Gasket.
Line a 7" Pan with butter or oil and place the parchment paper.
Measure the Flour, baking powder and salt in a bowl.
Separate the egg white and yolk. Beat the Egg white till soft peaks and reserve.
Now measure the butter, beat using electric beater till pale color.
Add Sugar beat till creamy. Add in the yolk and vanilla extract. Beat till incorporated.
Add the flour mix and milk alternatively starting and ending with flour.
Now add in the beaten egg whites and fold gently. Don't over mix it.
Finally mix vinegar and soda in a separate bowl and fold in the batter with sprinkles. (in the image you can still see some specs of egg whites. To avoid over mixing, i folded in the sprinkles also.)
Pour in pan bake it till golden brown top, for about 30-40 min in cooker or until tooth pick inserted comes out clean.