I do the creator burger, choose angus beef, which comes with bacon, click on zero for all the condiments, including zero for the pickles and onions, have extra lettuce, extra cheese, and of course - zero buns.
This is a good way to eat out at Maccas with my ol' mum when I go visit her. Not cheap - but filling, and does not raise the BGs.
Sometimes the crew get it wrong, and I have to explain that zero buns does not mean zero lettuce and tomato - but they always add this without argument when I go up to the counter holding out the pathetic thing without the salad to hold it together. I learnt to order the extra lettuce and extra cheese, so they are more likely to get it (ie the bunless burger).