Place sliced peaches and blueberries into a baking dish, then sprinkle over 2 tablespoon of golden caster sugar and mix slightly to combine then set aisde.
Crumble Topping
Melt butter in a small heatproof bowl, then add vanilla & ⅓ cup golden caster sugar and mix to melt slightly and combine.
Add flour & baking powder to melted butter mixture, and mix well to combine. You should end up with a dry, crumbly biscuit-like dough which will hold together in clumps when chunks are pinched together in your fingers - see my video.
Assembly
Take clumps of the crumble mixture (a large pinch at a time) and place evenly over the top of the fruit mixture.
Bake uncovered for 30 mins.
Video
Notes
You could substitute nectarines or another variety of peach for the yellow peaches, depending on your taste and what's available.The baking dish I used in the photos was 30cm x 20cm x 5cm (12" x 8" x 1.5") I wouldn't go any larger than that. Smaller is fine, anywhere down to approximately 25cm x 20cm x 6cm (9.5" x 7.5" x 2.5").Peeling the peaches or not...this is totally your choice if you do or you don't. It tastes great both ways - when the peaches are really ripe and soft they are easy to peel, so I peel them. When they are a bit firmer they are tricky to peel so I don't.If you are going to peel the peaches, I find the best way is to cut the peaches into 8 slices first, then peel the skin off each slice. Much easier than trying to peel the whole peach, then slice up a slippery peach!*Please note that the amount of calories per serve is provided as a guide only, as ingredients and cooking methods can vary greatly*