Preheat oven to 180C/160 fan. Prepare a flapjack tin or ovenproof dish.
Mix oats, flour, sugar and cinnamon together. Add the oil and mix to a crumble texture.
Press 2/3 of the mix into the tray. Cover with the berries. Now too with the remaining crumble mix.
Bake for 45 mins until it’s golden brown on top.
These will keep for up to 5 days in an air tight tin and taste amazing on their own or with custard.