Mix the instant coffee and the milk in a small pan. Then, put the pan to heat and bring the coffee to a simmer, before keeping it aside.
Whisk together the butter and sugar till light and fluffy (use an electric hand mixer if you have one).
Next, add the milk and condensed milk, whisking well to combine.
Sift the flour, salt baking powder and baking soda; then fold these dry ingredients into the wet batter using a spatula until just combined.
Next, fold in your chocolate chips, taking care not to over-mix.
Pour the batter into a lined 6/7 inch cake tin/ equivalent loaf pan, baking at 180° C for 30 – 35 minutes; you’ll know the cake is ready when a skewer or toothpick inserted in the centre of the cake comes out clean. Don't be alarmed if the cake sinks in the middle - it will not affect the final flavour!
Cool the cake tin on a wire rack, before tucking in.