I have to cook way longer than recipe says.
This is usually caused by a weak oven ignitor. As they age, they seem to perform less effectively. Sometimes the oven will take several minutes to ignite the first time, and even worse on subsequent ignition cycles, resulting in overall low oven temp and poor baking. Replace the oven ignitor. Note, if you have a self clean gas oven, the ignitors are usually the same part number for the bake and broil, so you can try moving the broil ignitor (which is generally used much less than the bake ignitor) to the bake burner if you want to test it out before buying a replacement ignitor.
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