Preheat the Oven @ 180 deg for 10 minutes. Line and grease a 8 inch square tin with butter and dust well with flour. Sift the flour with baking powder and baking soda into a bowl and keep it aside.
In another bowl mix well with a hand whisker melted butter,condensed milk,orange juice,powdered sugar,vanilla essence and apple cider vinegar until everything is mixed well.
Make a well in the sifted flour mixture and pour the whisked wet ingredients mixture in the center and gently mix the mixture until you get a smooth and uniform mixture without lumps.
Add orange zest to it and mix well.Pour the mixture into the greased square tin and tap it twice to remove the air bubbles formed if any.
Place this pan in the center of the oven and bake it for 35-40 minutes until the crust is golden brown in color or if the tooth pick comes out clean when inserted into it.
After 5 mins remove it from the pan and let it cool on the wire rack.Cut into square wedges and serve.
Store it in the air tight container.
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