Mix together all the ingredients in a large bowl until well combined and spoon the mixture into the prepared tin.
Place in a preheated oven, 180°C (350°F), Gas Mark 4, for 20 minutes.
Leave to cool in the tin, then mark into 15 squares and chill until firm.
Store in an airtight container and eat within 3–5 days.
Notes / Tips / Wine Advice:
For chocolate fruit & nut squares,
place 75 g gluten-free white chocolate and 75 g gluten-free plain dark chocolate in separate heatproof bowls over saucepans of simmering water and leave until melted. Drizzle over the cooked and cooled squares and leave to set.Calories per square 309