not enough baking powder for the amount of flour: use two teaspoons per two cups flour, try 425-450 for preheated oven. Put biscuits in cast iron skillet not preheated, also it matters what flour you use. I prefer buttermilk; if you use buttermilk add some baking soda. You should also play around with sour dough biscuits. Some folks really prefer them to regular biscuits. LIke ME!
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