over-mixing of the dough...you should see some inconsistencies in the mixture...over mixing will tighten the gluten - hence toughen it then when it bakes those areas in the bread where the inconsistency will be air pockets - called tunneling.
Poor mixing
A few quick breads are biscuits, banana bread, and cornbread.
YeastGlutenBake
because breads require flour to make it a bread.
a yeast dough uses yeast and a quick bread uses baking powder or baking soda.
Milk
quick breads
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Kelsey's Essentials - 2010 Quick Breads 1-4 was released on: USA: 2010
water foodmilksometimes paperquickand bread
shut the hell up
Quick breads are leavened with baking powder or baking soda. Yeast breads are leavened with yeast, and require more time to rise.
Breads and quick breads expand because of air. In yeast breads the yeast eats the sugar and makes carbon dioxide that puts air into the bread. In quick breads a chemical reaction similar to vinegar and baking soda makes air that expands the bread. Bread that has been expended is softer to eat.