I do not grow mine in hills. I plant the seed potatoes shallowly in the soil and then cover with a deep layer of straw. I guess that I actually hill up the straw. You need to keep light excluded from the developing tubers.
This works well for a home gardener but wouldn't work so well in a farm application because you would need LOTS of straw.
DSC00880 by
Brownrexx, on Flickr
Here is what the potatoes look like when I pull the straw back using just my hands. The 2 red ones must have come from a volunteer plant because my potatoes were planted in the same location as last year when I grew red ones. .
20180812_122732 by
Brownrexx, on Flickr