Preheat the oven to 160℃fan/180℃/350℉/gas 4 and line a tin or oven proof dish (approx. 15cm x 25cm) with baking paper.
Filling
Combine the redcurrants, tayberries, cornflour and sugar in a bowl, remove the excess juice and set aside.
160 g Redcurrants, 60 g Tayberries, 3 tbsp Cornflour, 60 g Caster Sugar
Base and Crumble
Add the butter, egg yolk, sugar, oats, flour and baking powder to a mixing bowl. Use either your fingertips or electric mixer with paddle attachment to mix together until you have large crumbs and the mixture stays together when pressed.
1 Egg Yolk, 150 g Light Brown Sugar, 150 g Rolled Oats, 200 g Plain Flour, ½ tsp Baking Powder, 175 g Butter
Add a third of the mixture to the base of the dish and spread out and press down with back of a spoon or your fingers. Bake in the oven for 15 minutes.
Pour the fruit onto the base and scatter the remaining crumble mixture. Bake for 30 minutes until golden.
Leave it to cool in the dish then cut into bars.
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Notes
TOP TIPS
Mix the berries with sugar and cornflour/starch to help thicken the filling.Remove the excess juice.Layer the berry filling evenly over the crust to ensure every bite is bursting with fruitiness.Make sure the base layer of crumble is thicker than the topping.Allow the crumble bars to cool completely before cutting into squares to ensure they hold their shape.For an extra touch of sweetness, drizzle a simple icing glaze over the cooled bars.