When doing baked goods like muffins, breads and such I often preheat the oven 25 degrees higher anyway. Once you open the oven, I think the temperature would plummet and heating the oven higher - especially when I make muffins - gives them the temperature they need from the beginning. You guys are the experts, but this technique has worked for me quite a while. My cupcakes and muffins turn out taller.

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