Preheat the oven to 180*C.
Combine the diced apples & blueberries in a bowl, sprinkle over with the flour & caster sugar, and stir until evenly coated.
In a second bowl, add the oats, flour, almonds, sugar, baking powder & salt. Whisk to evenly combine, then add the cubed butter. Using your fingertips, rub the butter in until you form coarse crumbs and there are no lumps of butter remaining.
Transfer the fruit into the ramekins into an even layer, then top with the crumble mixture.
Bake for 20-30 minutes; the top should be evenly golden and the fruit gently bubbling. Set aside for 10 minutes to cool, then serve with vanilla ice cream or creme fraiche.