Spoon the mixture into the baking tin and spead out evenly. Drop spoonfuls of the jam all over the top, then using a butter knife or skewer make swirly patterns. Gently press the jammie dodgers on top. Bake in the oven for 30-40 minutes or until risen and golden. The blondies will still be quite soft in the middle, so cool in the tin for at least two hours before turning out and cutting into squares.