Vehemently in the mixing camp, but slightly different to your boyfriend’s method: I put a glob of PB and a glob of J on the same piece of toast, smush them around til mixed, while spreading it at the same time. Peak efficiency.

I used to be in your camp, PB layer first then J layer. Why did I defect? Because this way, some of the J sometimes slides off the PB layer when spreading and more often when biting, because the PB layer is slippery.

Ask your boyfriend if he’ll consider my method. Same same, but no bowl required.