How many pans were on the rack? How large of pan were you using?
Hot air must be able to circulate to cook food evenly. Allow 2" of space/clearance around baking pan(s) and the oven walls.
Was an entire oven rack or oven bottom lined with aluminum foil?
Do not cover an entire oven rack or the oven bottom with aluminum foil below the baking pan. This can block good air flow.
CLICK HERE for information on why airflow is important.
CLICK HERE for more information on how to correct uneven baking and browning
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