Good morning,
I recently made a batch of the old-fashioned donuts. I used the exact measurements with a food scale and did not substitute anything, the only step I messed up (possibly) is I mixed all the wet together at once instead of adding the sour cream after mixing the sugar/egg. I also didn't bother cutting out the middle holes but I am 99.99% sure that's just a visual thing and doesn't affect the cook.
I found the donuts were more bread-y than cake-y with slightly chewy texture. Nothing like the sour cream glazed donuts I have bought from stores which melt in your mouth.
Did I overmix? Did I overcook? I was mixing it by hand (my hand mixer doesn't do dough, need to buy a Kitchenaid when I can afford it...) and having trouble getting the batch together. Or perhaps my butter/sour cream wasn't well distributed? It felt like it needed more butter or other fat.
Would love some advice! Thanks!