Boil potatoes whole in salted water until just slightly shy of done (little hard in center is fine when poked with a fork). Drain, cool and set aside.
In a medium sauté pan over medium heat melt butter in oil and add onions, garlic and jalapeno and sauté for 3-4 minutes until the onions are just starting to get soft.
In a very large bowl, shred skin-on potatoes using the large holes of a box grater.
Add cooked onion mixture and stir to combine.
Add eggs, salt, pepper, cheese and the 3 tablespoons of flour and stir to combine. Refrigerate for a few hours or overnight covered.
When ready to serve, using an ice cream scoop, scoop out into 12 individual balls and flatten into cakes about one half inch thick onto a parchment lined pan.
Pour the ¼ cup flour into a sifter and dust one side then flip with a spatula and dust the other using all of the flour.
In a large skillet or grill pan, melt butter with oil over medium heat and once hot and frothy, place six cakes into the hot fat using a spatula. Cook for three minutes and gently flip and cook the other side for three more minutes. Remove to a platter and once the pan is hot again, repeat for the remaining six, adding more butter if needed.
Serve hot with sour cream.
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Notes
The mixture is easier to use chilled so leave enough time to refrigerate before frying. I made the mixture the night before.