How to Complete Mushroom Chef
The objective is to find a Baptiste Mushroom. You have to check the sparkles until you have found the correct one. If you pick the wrong one, there will be a message saying that your unit doesn't feel well, or something similar. However, your unit will not actually suffer any ill effects if he or she tries the wrong type of mushroom.
The enemies in this battle, which you can ignore if you wish, are a Sprite, Lilith, Dreamhare, and Lamia. The Lilith and Lamia can inflict Charm on your units. You can cure this status ailment by hitting the affected unit. If you have a Knot of Rust item, you can throw it at the Charmed unit to get rid of the status ailment without causing a lot of damage.