Plant your seeds on new Year’s Eve.
Airing cupboard to begin with, until you have seedlings
then small pots on windowsill
then larger pots on windowsill
only put outside when there’s no chance of frost
put into large pots and feed like a tomato plant
Reap!
You could do competition by circumference x weight = winner as bonnets are very variable shapes. If you grow a couple of bonnets then remove all fruit aside from one plant, this allows the plant to make one fruit only into a monster. Numex are bushy and very heavily laden, most chillis on plant might be a good one here.
Good luck