On or Off Oven / by Alan Strathman

I have started making pizzas at home.  They are really delicious.  And the grocery stores here have all the fixings. Except that fresh mushrooms are too expensive so I have to use canned.

On the package of frozen crusts I buy they offer the following directions: Preheat oven to 425F then reduce to 375F for 12-15 minutes. Preheat oven to 425F then reduce to 375F? Uhhh.......This is my oven control button:

I have not yet figured out what the little rounded rectangle means. The only kind of cooking directions I can actually follow are: Turn oven on. Cook food. Turn oven off.  How will I ever make a soufflé under these conditions?