Preheat your oven to 350°F (175°C).

Coarsely grate the sweet potatoes, transfer them to a bowl of cold water, and swirl to release excess starch.

Drain and squeeze out as much moisture as possible from the grated sweet potatoes.

In a large bowl, combine the dried sweet potatoes with chopped onion, eggs, flour, salt, and pepper, mixing until cohesive.

Heat oil in a skillet over medium heat for about 3 minutes until shimmering.

Scoop the mixture into the skillet, flattening each scoop into a patty.

Fry patties for 3-4 minutes per side until golden brown and crispy.

Transfer to a baking sheet and bake in the oven for 10-12 minutes for extra crispiness.

Serve hot, optionally garnished with sour cream or fresh herbs.