Boursin cheese is available in most grocery stores and comes in various flavors, with Garlic and Fine Herbs being the most popular and the one I recommend here.
Feel free to swap the Parm with any other hard cheese you like. Mozzarella works well, too!
To get the zucchini ready, make sure to wash and dry them before slicing them into thin pieces. Aim for a thickness of 1/4" to 1/8", but the most crucial thing is to slice them to a consistent thickness. That way, they will cook evenly and finish at the same time.
Slice the tart into 12 or 16 square pieces and serve while it's warm or at room temperature.
Leftover zucchini tart can be stored in an airtight container for 1-2 days and reheated in a toaster oven.