Into a bowl take 1 cup of plain flour. Add baking powder, baking soda, salt, and icing sugar. Measurement stated, above. Mix them nicely. Add unsalted butter (should be at room temperature) and condensed milk. Combine, and mix them nicely and knead using hands or a machine and then scoop out and place the cookies onto a baking tray on top of parchment paper, and bake them at 350-degree Fahrenheit for 10 minutes when these turn slightly crispy outside. At this point Just take them out and Do not overbake. Keep them out and allow them to cool. Serve these when cold and enjoy with milk or a cup of coffee.