For my choco donuts, i'm still using uht milk, then add 1 teaspoon of choco powder to the plain flour.
ppp,
when u mixed the dry ingredients to the wet ingredients, stir gently, shieve the flour before u mix it.
Dun give up ya? Practice makes perfect.
My first batch of donuts end up in the dusbin, too sour, rubbery n over baked.
happy trying again!