Yeast is a type of fungi, thus a live ingredient, it needs sweetness, warmth and humid to help raise the dough (it grows and multiplies).
Baking powder is chemical, it reacts with the heat and produces air.
Some recipies use both, I don't think that was the reason behind the craking.
Dough cracks for many reasons;
It could be the density of the dough (too thick, or too watery will make it break)
Heat and amount of oil (donuts should be deep fried, too much heat with raw - not frozen dough- will make it break)
Fliping the dough around too much also makes it crack.
I've made donuts before, but I have no idea which recipie I used. It was something from the internet though.
My suggestions:
Search for ''easy donut recipie''
put your dough in the freezer for about an hour before you intend to fry it.
Use a deep fryer or a large skillet with plenty of oil
Make sure the oil is heated well before you fry your dough.
Good luck!
hope it works
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