Line crackers on their sides (Edges, like they were in the sleeve) in rows of a plastic dish with a tight fitting lid (These Rubbermaid Takealongs are perfect). Don't worry if they won't all fit, just put as many as you can.
Pour oil in a 1 pint canning jar. Add dressing mixes and Parmesan cheese. Screw on lid and shake jar well.
Slowly pour all of the mix over each row of crackers.
Put on casserole lid and flip it over. Let sit for 5 minutes. Flip the casserole back over and let sit for 5 minutes. Repeat every 5 minutes for 1 hour and they are ready to serve.
Store, tightly sealed, up to one week if there are any left over.