I'd imagine that there are probably doughnut mixes out there somewhere. But a cake doughnut is a pretty simple dough, why not try making some from scratch?
https://www.epicurious.com/recipes/food/views/coffee-doughnuts-with-coffee-glaze-56390164
https://www.epicurious.com/recipes/food/views/mini-cake-doughnuts-51123670
https://www.epicurious.com/recipes/food/views/chai-doughnuts-with-spiced-sugar-56390163
Waffles are even easier, you (usually) don't even need an electric mixer!
... And both are far easier than working with chocolate 😂