No, just cut the bars into little squares, about a 1/4" or smaller....then make the batter,making it slighlty wetter then you might usually do, then stir in the chunks, and they melt and get gooey, and the edges get kind of crispy - its gorge!! I cook mind for 1 minute 40 seconds on high in an 800w microwave. Good luck!!
My favourite is Vanilla with 1/4 or tsp of St Clements and the lemon bar. I swear it comes out like cake! Caramel is good with both the toffe or the fruit bars. Enjoy!!