Will be attempting one of these next week for DD's 4th bday. Can someone give me a definitive recipe for a 1 litre Pyrex pudding bowl please? The recipes I've googled are all vague about quantities, how far up I should be filling bowl (don't fancy scraping sponge batter off the oven!), and cooking times. I appreciate that it is harder to judge times as cake needs to cook right through to middle - would I need to cover with foil half way so it doesn't burn on top? TIA