Soak your grated potatoes in a bowlful of cold water for 15 minutes. Drain in a colander, lightly squeezing to extract excess water. Transfer the potatoes to a clean kitchen towel. Wring out the potatoes by twisting the towel.
Preheat 3 cups of vegetable oil in a 3qt skillet to 350-375°F.
Meanwhile, in a large mixing bowl, combine the potatoes, onion, flour, salt, baking powder, and eggs. Mix well to combine.
Scoop a 1/4 cup of the potatoes into the hot oil, carefully. Fry for 3-4 minutes, or until the sides turn a golden brown. Flip the latkes over and fry an additional 3-4 minutes. Remove the latkes from the oil using a slotted spoon and drain on a paper-towel lined dish.
Continue frying until all the batter has been used.
Top with your desired ingredients and enjoy immediately.