Here's some great info - check it out for more details: http://www.wildmanstevebrill.com/Mushrooms.Folder/Giant%20Puffball.html
I haven't had the luck some mushroom hunters to find lots of giant puff balls but from the ones that we have found, I've come up with a really awesome recipe for Puffball Parmesan. The best part is - it's gluten-free and low carb!!
Puffball Mushroom(s) - remove dirt and any tough outer skin
Fat for Frying - I recommend Lard, Tallow, Butter or Coconut oil
Tomato Marinara Sauce for topping
I can't give you exact measurements - it depends on how much mushroom you've found!
Take your clean puffball, slice about 1/2 inch thick (you'll be sure its all white too!) Dip the slices of puffball in beaten egg then bread with parmesan cheese then fry over medium heat till golden brown, drain on a paper towel lined plate, serve with Marinara Sauce. I can only explain the taste as cheese crusted mushroom flavored marshmallow!