Step 1

Preheat the oven to 190C/375F/gas mark Grease a 20cm/8in square tin and line with baking parchment.

Step 2

Mix together the oats, flour, baking powder, sugar, cinnamon and salt in a large bowl.

Step 3

Add the vegan butter or coconut oil and rub in using your fingertips until the mixture resembles breadcrumbs.

Step 4

Tip about two thirds of the mixture into the prepared tin. Spread it out level and pack it down very firmly.

Step 5

Bake for about 15 minutes until golden around the edges.

Step 6

To make the filling, mix the cornflour and lemon juice together in a large bowl to make a paste. Stir in the jam followed by the berries.

Step 7

Tip the filling over the base and spread level.

Step 8

Scatter over the remaining crumble mixture. Bake for 25-30 minutes until the crumble is golden and the filling is bubbling.

Step 9

Leave to cool in the tin then carefully lift it out using the baking parchment, cut into squares and serve.

Step 10

Store any leftovers in the fridge.