I have not used this cookbook, but I have tried sneaking nutritious foods into what I make and it so far has been successful.
I add veggies and a jar of spaghetti sauce into my blender and serve all of my pasta dishes this way. I typically use squash, zucchini (sp?) spinach and carrots for this. My kids don't even know the difference. I even make homemade pizza with this sauce!
When I make casseroles that don't call for veggies, I puree the veggies in the blender and add them to the casserole.
I make waffles and pancakes from scratch, using whole wheat flour, flaxseed meal or wheat germ. This adds a little bit more nutrition and once again the kids don't even know it's there. I sometimes puree bananas and add that to my waffles.
We also make juice in a juicer to add more fruits and veggies to our diet. I hope this helps. I would say to go ahead and buy the cookbook, but look through it first to make sure the recipes are something that your kids will eat. My method is pretty easy, as it doesn't take much planning and I usually just use what I have in my fridge at the time.