The only thing I've read about cooking is the psilocybin is actually adversely affected by heat and breaks down, so you get less when you heat mushrooms. I would try making a Vitamin C smoothie (Orange Juice, Ice, maybe some Tropicana juice, ionnno go crazy) with them in a blender. No cooking so the chemicals stay in tact, but the mushrooms are disguised in the fruity drink.
I have a feeling a lot of the time people get psyched out and think "eww I'm eating this gross mushroom, it feels so weird going down, I wanna gag.." and then you get nausea and want to throw up. Like my brother went to sushi for the first time and loved it, he had like 2 rolls. And as soon as he read the disclaimer on the menu "warning raw fish can cause illnesses" he threw up in the resturaunt. Your brain is a very powerful instrument.