Working out per portion is a nightmare
I aim for 0.5 - 1.0g per portion, but it's hopeless
So I have to try one muffin/cookie then grade it as 'fine', 'careful', or 'that's a bit much' before I share
Sometimes I forget to use 50/50 canna/straight butter and it's a bit savage even for me
That turns my girlfriend into a white out mush, so it's quite important to get right unless I want to spend the evening listening to her spouting gibberish and giggling about Wensleydale