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Improper mixing. We don't mix breads long enough; we mix biscuits, muffins, and pancakes too long. Mixing develops the gluten. It's the gluten that creates the elasticity and chewiness in bread. We want products leavened with baking powder or baking soda to be tender and flaky. Mix the dry ingredients to distribute them well and then combine the dry mixture with the wet ingredients until they are evenly mixed but no more. Leavened products that are over-mixed are tough and leathery.
Improper measurement. We suspect that more often than not, ingredients are not measured properly. In many good recipes, there is some margin for error but even in the good recipes, the product will be better if the ratio of ingredients is correct. Measure liquids in clear containers designed for liquids and at eye level. Use measuring cups that you trust to be correct. (We recently compared four brand name measuring cups. One was off by a full tablespoon in one cup.)