Perfectly safe and easy to make just use slightly fresher bread.and make surr you cook for long enough. You put buttered bread slices in layerswith rraisins sprinkle sugar and cinnamon if u like cinnamon on then layer up in a Pyrex dish. Then in a seperate bowl beat 3 eggs and milk till completely mixed then pour this over bread n raison layers then pop in oven around 25-30 mins. It shouldn't be runny really just soggy as that's from milk you will be able to see. Can also add sprinkled nutmeg too x