Use an oven thermometer placed in center of oven for an initial reading of oven temperature. Record results here: ___________. When oven is properly preheated, place both sheet pans in oven and set...

Use an oven thermometer placed in center of oven for an initial reading of oven temperature. Record results here: ___________.

When oven is properly preheated, place both sheet pans in oven and set timer for 19–21 minutes, or according to formula.