Place 1/4 of the potatoes, onion, eggs, salt, flour and baking powder in a food processor; pulse several times until the vegetables are finely diced. Add the rest of the potatoes then pulse again until all the potatoes are finely diced and the mixture is thoroughly combined.
Heat canola oil in a frying pan over medium heat. Scoop up about 1/3 cup of the potato mixture per latke then place into the hot oil. Fry the patty until brown and crisp on the bottom, flip it then cook the other side until brown, 2 to 3 minutes per side. Repeat with the rest of the potato mixture, replenishing the oil as needed. Serve hot.
Apple sauce and sour cream are favourite accompaniments with these latkes. Make an interesting tuna salad, cut up some veggies, and you have a full meal.