Let me answer your questions. :)
You remove the gills from mushrooms purely for aesthetics. They will turn your dish an unsavory shade of black. You can leave them in if you wish. It shouldn't take more than a minute (literally) to remove the gills, so omitting that step doesn't save much time.
Yes, kale is a fine substitute for chard--you'll need to cook it longer.
As for the vegetarian and vegan recipes, we have an entire chapter on vegetarian main dishes, plus most of the recipes in the salads, breakfasts, vegetables, whole grains, and desserts/snacks chapters are vegetarian. Of the 170 or so recipes, 108 are vegetarian or vegan. That's 64% of the recipes--quite good for a cookbook that is not exclusively vegetarian. I don't eat meat, so I worked very hard to make sure there were plenty of easy, delicious meat-free meals in the book.
As always, thank you for your support of the cookbook. I'm happy to answer any and all questions you might have.
"Maybe chance is a pretty common thing after all. Those kinds of coincidences are happening all around us, all the time, but most of them don't catch our attention and we just let them go by. It's like
fireworks in the daytime. You might hear a faint sound, but even if you look up at the sky you can't see a thing."
"When you want something, all the universe conspires in helping you to achieve it."