Yoghurt pot emergency no equipment cake.
Classic kindergarten cookery activity or to make when you have no scales. It will survive poured into and baked in a tin/dish/pyrex of any roughly OK size and can be flavoured or perked up however you like. It's all done by ratios so just use the yoghurt pot that you have.
1 x 125g pot yoghurt.(Standard plain yoghurt)
1 x the rinsed out yoghurt pot of oil. Any cooking oil. Margerine or butter is OK as well.
2 x the yoghurt pot of sugar.
3 x the yoghurt pot of self raising flour/plain flour + level tablespoon baking powder.
3 eggs.
Mix everything together. Add vanilla flavouring. Or cocoa powder. Or throw in some blueberries and a squirt of lemon + zest. Or don't. Mess with it how you fancy really. Add a handful of chocolate chips. Or multi coloured sugar sprinkles. Raspberries maybe. Apple chunks and cinnamon to make it into an apple cake.
Anything within reason or nothing at all.
For this size of yoghurt pot a 23cm/9inch wide cake tin is ideal but anything oven proof that the mixture comes about 2/3rds of the way up the sides will do. Grease and flour it/line with greaseproof etc. Use what is to hand.
Bake for 35mins approx at 180°C.
*I've never actually used flavoured yoghurt in this but the recipe is more or less impossible to ruin so you could always try.
Cheap, easy and surprisingly good. I daresay you could do it in an air fryer with a bit of fiddling about as well but I haven't got one to be able to advise you on this matter.
There's probably some kind of clever mnemonic or trick to help you memorise the number of yoghurt pots for each ingredient but I don't know it.