This cake can be served warm or cold.
Ice-cream or yoghurt make great additions when serving!
You can substitute the raspberries for any frozen berries you like.
You can also substitute the tinned apple for any tinned fruit you like.
This cake may take longer than 60 minutes to cook depending on your oven. It's ready when a skewer inserted into the middle comes out clean.
If you notice the crumble is browning too much, simply place a sheet of foil over the top and continue baking.