I didn't say that. I said you need a USB to USB C cable. One end is USB that goes into the 5 watt charger and the other end is USB C that goes into your iPhone 15. You don't need an adapter. But since Apple doesn't make that cable and you don't want to buy a cable that isn't Apple, then that ghetto set up you have with the adapter in between is your only option.You cannot connect a USB-C Cable to an Apple 5W Charger. That's not possible. You need a dongle to support that I think.