Do you need a recipe book? I have the same soup maker and just use what's at hand. I use up vegetables and have a supply of lentils/ broth mix etc. Odd bits of chicken etc are added if they need to be used up. I just chuck it all in, add stock and water up to the line, select smooth or chunky and Bob's my uncle. 21 mins later for smooth or 28 mins for chunky. Best kitchen gadget I've ever bought.
I'm sure your DH will enjoy experimenting with different ingredients and flavours.