I definitely cook this way sometimes, although not with butter. But say I have a recipe that calls for 1 kg of chicken and I have 1.25 kg. I'm going to use al

I definitely cook this way sometimes, although not with butter. But say I have a recipe that calls for 1 kg of chicken and I have 1.25 kg. I'm going to use all that chicken and scale everything else up by a factor of 1.25, rather than being stuck with that extra 250 g of chicken. Of course, this only works if you don't mind having too much food. I like leftovers (I get to eat without having to cook!) so it works for me.