Muffins problems, diagnosed

Dry muffins usually come from overbaking, too much flour, overmixing, low-fat or low-moisture substitutions, or uncovered storage.

Sunken muffins usually have an underbaked center, too much leavener, overfilled cups, too much wet fruit, or an early oven interruption.

Flat muffins usually point to weak or missing leavener, batter that waited too long, an underheated oven, or batter that was diluted too far.