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Here are some helpful solutions for the common causes:
Overmixing is a common problem with muffins. First combine dry ingredients, mixing well. Then combine liquid ingredients, mixing well. Finally combine dry and wet ingredients, by hand, using only 15 to 20 light strokes. There should be lumps in the batter.
Avoid filling the muffin cups too full. Each recipe is different, so read the recipe, but most recipes call for filling muffin cups 2/3 to 3/4 full.
Oven thermostats can vary over time, requiring adjustments by the baker or calibration by a professional. To insure the correct temperature each time you bake, always use an oven thermometer. Place it in the center of the oven. Adjust oven dial up or down to correct the oven temperature.
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