When you get the cookbook from the gaint shy guy in the toy box, give it to Tracy T. Then go to Koopa Village and colect 7 koopa leves. The go to Dry Dry Outpost ans buy 3 mushrooms. Go back to Tracy T. in Toad Town. Next give her a mushroom and a koopa leaf and she'll make a voltshroom. Then talk to her again and this time give her the voltshroom and a koopa leaf. That will give you a lifeshroom. Repeat the process as many times as you please. When your done making lifeshrooms go to the Toad Town item shop and sell them. Repeat the process until you have 1,000+ coins!