Preheat the oven to 180°C (gas mark 4, 350°F) and line a baking tray with parchment paper.
Add butter, condensed milk and sugar into a large mixing bowl and cream together until fluffy and light.
Add flour and chocolate chips to the mixing bowl and mix together until a dough has formed.
With a spoon, scoop a bite-sized piece of dough into the palms of your hands and roll into a ball shape. Then place on a lined baking tray with parchment paper and press down gently with your fingers to flatten it.See my video for reference on how I did this.