Preheat oven at 180°
Mix curd and sugar
Add vanilla essence,baking soda and baking powder and mix it
Add all purpose flour in batches
Add oil and milk and mix it nicely
Grease rounds baking mould
Cut gulab jamun in pieces
Pour half batter in mould and arrange gulab jamun pieces on it
Cover it with remaining batter and tap it twice and bake in oven for 25 minutes or till the toothpick inserted comes out clear
Cool down and decorate it by making patterns on it with powdered sugar and gulab jamun pieces