3, although I'd be very tempted by 2 but would depend how heavy on the peppers you were.... I can't stand them so they have to be fairly inconspicuous for me to chance it.
i love pasta but hate courgettes so would look wistfully at 1 and give it a wide berth.
Keely.... I'm oddly pleased to have come across another pepper and courgette hater. Most people look at me blankly and say 'But they're cooked in, you won't notice them' 